| 单词 | Mollusca |
| 例句 | This verbal slippage, between Alexa and Mollusca, serves as a trap door to thinking about language, time, history and human consciousness. What to See in New York Art Galleries This Week 2018-10-11T04:00:00Z As art, it takes the form of a psychedelic 3-D video installation, ceramic sculptures in various sizes and paintings on lenticular photographs in the show “Mollusca & the Pelvic Floor” at Greene Naftali. What to See in New York Art Galleries This Week 2018-10-11T04:00:00Z The key to the exhibition, according the gallery, is knowing that Alexa also responded to Ms. Baga using the name “Mollusca.” What to See in New York Art Galleries This Week 2018-10-11T04:00:00Z The phylum Mollusca is a large, mainly marine group of invertebrates. Concepts of Biology 2013-04-25T00:00:00Z The octopus’s position in the Mollusca phylum illustrates evolution at its most spectacular, Hochner says. Octopus genome holds clues to uncanny intelligence 2015-08-11T04:00:00Z Scientists recognize eight major phyla to describe most common animals: Porifera, Cnidaria, Platyhelminthes, Annelida, Mollusca, Arthropoda, Echinodermata and Chordata. Systems Science: How Biodiverse Is Your Backyard? 2014-10-02T04:00:00Z Rather, it belongs to the phylum Mollusca, along with the squid, octopus, clam and snail. Cats can cause painful and dangerous damage, even to people who care for them 2013-01-28T21:49:26Z Among the Jurassic Mollusca, also, are many species that are common in Europe. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z A division of Mollusca remarkable for the bilateral symmetry of the organs and the arrangement of the nerves. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z Chiefly known for his work on the Mollusca of the Crag. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters 2012-01-22T03:00:19.733Z But the most remarkable case of drying up that ever I heard of was that of the Egyptian snail in the British Museum, that Woodward tells about in his "Manual of the Mollusca." The Adventures of a Grain of Dust 2011-11-22T03:00:12.257Z In the marine Mollusca, therefore, we have a common ground of comparison between the stratified formations of different periods. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z The histology of the nervous system of Mollusca has yet to be seriously inquired into. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z That division of the Mollusca which includes the bivalve shells, like the clams and oysters; Ð so called because they have no evident head. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z The Mollusca, or soft-bodied animals, of whose protecting shells your collection consists, form a sub-kingdom, and are subdivided into four classes:— Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z F. Beaufort, quoted by Dr. S. P. Woodward in his 'Manual of the Mollusca.' Sea Monsters Unmasked and Sea Fables Explained 2011-07-11T02:00:07.857Z Now, of all the marine tribes which live within the juxta-terrestrial belt of sedimentation, unquestionably the Mollusca stand in the place of pre-eminence as regards their aptitude for becoming fossils. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z The general structure of the Molluscan intestine has not been sufficiently investigated to render any comparison of this structure of Patella with that of other Mollusca possible. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z A division of nudibranchiate Mollusca, in which the gills form a wreath or cluster upon the posterior part of the back. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z "Tabular View of the Orders and Families of the Mollusca." Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z Leaving Paris in April 1837, he went to Algiers, and there obtained materials for a paper on land and freshwater Mollusca, published in the Annals of Natural History, vol. ii. p. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z The food of the flamingo seems to consist chiefly of small aquatic invertebrate animals which live in the mud of lagoons, for instance Mollusca, but also of Confervae and other low salt-water algae. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z This is the largest group of Mollusca, including nearly sixty families, some of which are insufficiently known from the anatomical point of view. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z Such well-marked changes take place, for example, where the class Mammalia ends; at the points where Fishes are separated from Insects, Insects from Mollusca, &c. A System of Logic: Ratiocinative and Inductive 7th Edition, Vol. II 2011-03-01T03:00:40.557Z "A History of British Mollusca and their Shells." Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z In the autumn of the same year he registered at Edinburgh as a student of literature; and in 1838 appeared his first volume, Malacologia Monensis, a synopsis of the species of Manx Mollusca. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z Mollusca, an order of invertebrate animals having a soft, fleshy body, which is inarticulate, and not radiate internally. A Manual of the Antiquity of Man 2011-02-21T03:00:07.080Z GASTROPODA, the second of the five classes of animals constituting the phylum Mollusca. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z In Mollusca its fate presents the same variations as in Annelida. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Brachiopods are far more numerous than the Mollusca properly so-called. Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z These characters absent in the lowest classes—Brilliant colours—Mollusca—Annelids—Crustacea, secondary sexual characters strongly developed; dimorphism; colour; characters not acquired before maturity—Spiders, sexual colours of; stridulation by the males—Myriapoda. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z When I think of their Mollusca, I conceive the new ones must be very numerous. Lives of Eminent Zoologists, from Aristotle to Linnæus with Introductory remarks on the Study of Natural History For a discussion of the relationship of the Gastropoda to the remaining classes of the phylum, see Mollusca. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z For this reason, among others, it has been held by some zoologists that the mouth of the Vertebrata is not homologous with the mouth of such groups as the Annelida, Arthropoda and Mollusca. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z In these animals evolutionists see a link between the Mollusca and the Vertebrata. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli Although with the Mollusca sexual selection does not seem to have come into play; yet many univalve and bivalve shells, such as volutes, cones, scallops, &c., are beautifully coloured and shaped. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z Aceph′ala, in zoology, the headless Mollusca or those which want a distinct head, corresponding to those that have bivalve shells and are also called Lamellibranchiata. The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide The highest of the five types, or natural divisions, of animals are the Vertebrata, the Mollusca, and the Annulosa. Beautiful Shells of New Zealand An Illustrated Work for Amateur Collectors of New Zealand Marine Shells, with Directions for Collecting and Cleaning them Zoology was divided into 11 chief articles, “Mammalia,” “Ornithology,” “Reptilia,” “Ichthyology,” “Mollusca,” “Crustacea,” “Arachnides,” “Entomology,” “Helminthology,” “Zoophytes,” and “Animalcule”—all by James Wilson. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The Terebratulæ and Rhynchonellæ belong to a curious group of shells, the Brachiopods, which are placed in a class distinct from the Mollusca proper. The Geological Story of the Isle of Wight They belong to the Molluscoida of Huxley—a lower division of the great kingdom of the Mollusca; but they have recently been placed by some naturalists amongst the Vermes or worms. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z Brachiopods have been at various times placed with the Mollusca, the Chaetopoda, the Chaetognatha, the Phoronidea, the Polyzoa, the Hemichordata, and the Urochordata. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" No structure comparable to this siphuncular pedicle is known in any other Mollusca. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Dr. Kobelt has given us such an exhaustive memoir on the characteristic Mollusca of the different zoogeographical provinces of Europe, that we are particularly well informed as regards that group of Invertebrates. The History of the European Fauna Some Mollusca," says Professor E. Forbes, "migrate in their larva state, for all of them undergo a metamorphosis either in the egg or out of the egg. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Molluscs.—Among the Mollusca, Crustacea and Insecta yolk-stored eggs of very remarkable forms are commonly produced. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 "Edwardes" to "Ehrenbreitstein" We paid a visit to the Regent's Park Zoological Gardens the other day, for the purpose of noticing the collection of Mollusca, Zoophytes, &c., and very much regret to find it incomplete. Punch - Volume 25 (Jul-Dec 1853) The only other example which we have of this metamerism in the Mollusca is presented by the Chitons. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" A number of Mollusca are mentioned which from their range likewise indicate a Lusitanian origin. The History of the European Fauna Many fix themselves to the shells of Mollusca, and are thus borne along by them to short distances. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology In variety, in this connexion, the Mollusca must perhaps be given the first place. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 "Edwardes" to "Ehrenbreitstein" The skeletons of many other organisms, such as Polyzoa and Mollusca, contribute to coral masses but cannot be included in the term “coral.” Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 4 "Coquelin" to "Costume" In all Glossophorous Mollusca the lingual apparatus is supported by internal skeletal pieces, having the character of cartilage; but in the Cephalopoda such cartilage has a wider range. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Some Remarks on the Distribution of British Land and Freshwater Mollusca, "Conchologist," vol. ii., The History of the European Fauna Land Mollusca.—The land-shells of the Bermudas are somewhat more interesting, as they appear to be the only group of animals except reptiles in which there are any peculiar species. Island Life Or the Phenomena and Causes of Insular Faunas and Floras The eggs of the univalve Mollusca are hardly less varied in the shapes they take. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 "Edwardes" to "Ehrenbreitstein" Another copper-containing pigment is haemocyanin, which in the oxidized state gives a blue colour to the blood of various Mollusca and Arthropoda. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" This direct opening of the pericardial sac to the exterior is an exception to what occurs in all other Mollusca. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" CHITON, the name1 given to fairly common littoral animals of rather small size which belong to the phylum Mollusca, and, in the possession of a radula in the buccal cavity, resemble more especially the Gastropoda. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" The Dispersal of Land Mollusca.—The only other group of animals we need now refer to is that of the air-breathing mollusca, commonly called land-shells. Island Life Or the Phenomena and Causes of Insular Faunas and Floras With the Mollusca, as with other groups of animals, where the eggs are exposed to great risks they are small, produced in great numbers, and give rise to larvae. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 "Edwardes" to "Ehrenbreitstein" The Bryozoa have many affinities with the Mollusca, to which some naturalists consider them to belong. The Contemporary Review, Volume 36, September 1879 In all other Mollusca the segmentation is complete though in some cases very unequal. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Similarly of the Mollusca and Crinoidea, it appears that, while there are sundry genera found in America which are found here, there are scarcely any of the same species. Essays: Scientific, Political, & Speculative, Vol. I Such well-marked changes take place, for example, where the class Mammalia ends; at the points where Fishes are separated from Insects, Insects from Mollusca, etc. A System Of Logic, Ratiocinative And Inductive No place could be more convenient for the observation of the Mollusca and Radiata than Cape Venus. A New Voyage Round the World, in the years 1823, 24, 25, and 26, Vol. 2 His Balkan studies are as supremely competent as his monumental work on British Nudibranchiate Mollusca, published by the Ray Society when Sir Charles, having resigned the Governorship of East Africa, was Vice-Chancellor of Sheffield University. The Birth of Yugoslavia, Volume 2 It has the form of a small sac, 1 to 2 mm. in diameter, and contains whetstone-shaped crystals, such as are known to form the otoliths of other Mollusca. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" I ought to tell you also, that all these shell-fish have another name, still more general, which is Mollusca, or Molluscs. Charley's Museum A Story for Young People The parent-forms of Mollusca would probably differ greatly from all recent,—it is not directly that any one division of Mollusca would descend from first time unaltered, whilst others had become metamorphosed from it. The Foundations of the Origin of Species Two Essays written in 1842 and 1844 Car., which proved to be a species of Mollusca belonging to the Heteropodes of Lamarck. A New Voyage Round the World, in the years 1823, 24, 25, and 26, Vol. 2 The foregoing remarks appear to apply to the case of the Mollusca, which, at a very early period, had reached a high organization and a great development of forms and species in the testaceous Cephalopoda. Contributions to the Theory of Natural Selection A Series of Essays Literature.—Use has been freely made above of the article by E. Ray Lankester, on Mollusca, in the 9th edition of this Encyclopedia. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Lamarck’s special line of study was the Mollusca. Lamarck, the Founder of Evolution His Life and Work So, too, the brain of Arthropods or of Mollusca is not strictly comparable with the brain of Vertebrates. Form and Function A Contribution to the History of Animal Morphology In Kamtschatka we found the Bay of Awatscha poor in Mollusca and radiated animals, owing probably to the inconsiderable ebb and flood. A New Voyage Round the World, in the years 1823, 24, 25, and 26, Vol. 2 Mollusca and Radiata existed before Vertebrata, and the progression from Fishes to Reptiles and Mammalia, and also from the lower mammals to the higher, is indisputable. Contributions to the Theory of Natural Selection A Series of Essays The number of these teeth varies greatly in the different species of Mollusca—the group to which the snail belongs. Chatterbox, 1905. His special work was the classification of the great group of Mollusca, which he regarded as a class. Lamarck, the Founder of Evolution His Life and Work All the classes of Mollusca appear fully fledged, as it were. Form and Function A Contribution to the History of Animal Morphology They belong to the Molluscoida of Huxley, a lower division of the great family of the Mollusca; but they have recently been placed by some naturalists among the vermes or worms. Fables of Infidelity and Facts of Faith Being an Examination of the Evidences of Infidelity Mollusca in the Quito Valley are not great in number or variety. The Andes and the Amazon Across the Continent of South America The Mollusca in the codices are not always associated with the water although this is usually the case. Animal Figures in the Maya Codices First, that the unsymmetrical spiral forms of the shells of these and of all the Mollusca probably resulted from the action of the laws of heredity, modified by gravitation. Lamarck, the Founder of Evolution His Life and Work In the first of these two lectures he took four great groups of animals, the Vertebrates, the Articulata, the Mollusca, and the Radiata, and explained what was the archetype of each. Thomas Henry Huxley; A Sketch Of His Life And Work To ascertain the most peculiar, and most universal points of Mollusca and Pseudo cotyledonea, it is in this way that we may hope to extend our views. Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries It seems to me altogether probable that all, except possibly Mollusca, are descended from a common ancestor closely resembling the schematic worm last described. The Whence and the Whither of Man A Brief History of His Origin and Development through Conformity to Environment; Being the Morse Lectures of 1895 Mr Banks also brought back many curious shells, and Mollusca; besides many species of coral, among which was that called the Tubipora musica. A General History and Collection of Voyages and Travels — Volume 13 On the 7th, Mr Banks went out in the boat, and took what the seamen call a Portuguese man of war; it is the Holuthuria Physalis of Linnaeus, and a species of the Mollusca. A General History and Collection of Voyages and Travels — Volume 12 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time In this classification, only the Mollusca are taken into account; and it was found that of these about three and a half per cent were identical with existing species. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The Mollusca, especially the lacustrine and fluviatile, have been most imperfectly investigated; and of the land-shells, a large proportion have yet to be submitted to scientific examination. Sketches of the Natural History of Ceylon Mollusca live two hundred fathoms down in the Norwegian seas. The Abominations of Modern Society During this voyage notes of the habitats of considerably more than a thousand species of Mollusca and Echinodermata were carefully registered. Narrative of the Voyage of H.M.S. Rattlesnake, Commanded By the Late Captain Owen Stanley, R.N., F.R.S. Etc. During the Years 1846-1850. Including Discoveries and Surveys in New Guinea, the Louisiade Archipelago, Etc. to Which Is Added the Account of Mr. E.B. Kennedy's Expedition for the Exploration of the Cape York Peninsula. By John Macgillivray, F.R.G.S. Naturalist to the Expedition. — Volume 2 It is nowhere many miles wide; but this narrow point of land has hitherto proved a barrier to the migrations of many species of Mollusca. Excursions As before, only the Mollusca are taken into account, and about 17 per cent of these agree with existing species. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The Mid-Atlantic swarms with pelagic Mollusca, and, in moderate depths, the shells of these are constantly mixed with the Globigerina ooze, sometimes in number sufficient to make up a considerable portion of its bulk. Discourses Biological and Geological Essays Species of Mammalia, though less persistent than the Mollusca, change slowly. The Antiquity of Man —Difference of the Mollusca on the east and west coast of the Isthmus of Darien.—The refuge of the tropical American animals and plants during the glacial period.—The lowering of the sea-level. The Naturalist in Nicaragua Mollusca, on the Morphology of the Cephalous. —aim of this paper. Life and Letters of Thomas Henry Huxley — Volume 3 In the Post-Pliocene formations, while all the Mollusca belong to existing species, most of the Mammals belong to extinct species. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science We find, first, that the shells of pteropods and other surface Mollusca which are constantly falling on the bottom, are absent, or, if a few remain, they are brittle and yellow, and evidently decaying rapidly. Discourses Biological and Geological Essays Change in geographical Distribution of Marine Mollusca since their Origin. The Antiquity of Man Difference of the Mollusca on the east and west coast of the Isthmus of Darien. The Naturalist in Nicaragua When I advocated that opinion in my memoir on the "Morphology of the Cephalous Mollusca," some forty years ago, it was thought a great heresy. Life and Letters of Thomas Henry Huxley — Volume 3 Amongst the Mollusca, the Polyzoans and Brachiopods also require no special mention, beyond the fact that the latter are greatly reduced in numbers, and belong principally to the existing genera Terebratula and Rhynchonella. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science These shells of Mollusca decompose more easily and disappear sooner than the smaller, and apparently more delicate, shells of rhizopods. Discourses Biological and Geological Essays Change in geographical Distribution of Marine Mollusca since their Origin. The Antiquity of Man I am glad to be able to send you a copy of my memoir on the morphology of the Mollusca. Life and Letters of Thomas Henry Huxley — Volume 2 And I am conscious of a great tenderness for those contained in my ancient memoir on the "Morphology of the Cephalous Mollusca." Life and Letters of Thomas Henry Huxley — Volume 3 Upon the whole, about from 15 to 30 per cent of the Mollusca of the American Miocene are identical with existing species. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science On some peculiarities in the Circulation of the Mollusca. Life and Letters of Thomas Henry Huxley — Volume 1 Species of Mammalia, though less persistent than the Mollusca, change slowly. The Antiquity of Man First, a seashell is one of the 100,000 species of backboneless animals belonging to the zoological group known as the Mollusca. Let's Collect Rocks and Shells The early date of the carboniferous strata can not explain the enigma, because we know that while the land supported a luxuriant vegetation, the contemporaneous seas swarmed with life— with Articulata, Mollusca, Radiata, and Fishes. The Student's Elements of Geology The Mollusca of the Miocene period are very numerous, but call for little special comment. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science During the next session I mean to send in a paper to the Royal Society upon the "Homologies of the Mollusca," which shall astonish them. Life and Letters of Thomas Henry Huxley — Volume 1 As to the Mollusca, which afford the most unbroken series of geological medals, the highest of that class, the Cephalopoda, abounded in older Silurian times, comprising several hundred species of chambered univalves. The Antiquity of Man There are other epochs, besides that of the existence of recent Mollusca, by which to judge of the changes of level on this coast. Geological Observations on South America Fossil and recent wood drilled by perforating Mollusca. The Student's Elements of Geology A class of the Mollusca, comprising the Cuttle-fishes and their allies, in which there is a series of arms ranged round the head. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science He had continued the same work by tracing homologies of development in other classes of animals, such as the Cephalous Mollusca, the Articulata, and the Brachiopods. Life and Letters of Thomas Henry Huxley — Volume 1 The paper of Huxley's is "On the Morphology of the Cephalous Mollusca, etc." More Letters of Charles Darwin — Volume 1 These gigantic quadrupeds, therefore, though belonging to extinct genera and families, coexisted with the twenty above-enumerated Mollusca, the barnacle and two corals, still living on this coast. Geological Observations on South America Our dragnets brought up many specimens of polyps and echinoderms plus some unusual shells from the branch Mollusca. Twenty Thousand Leagues Under the Sea The class of Mollusca comprising the ordinary bivalves, characterised by the possession of lamellar gills. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Although with the Mollusca sexual selection does not seem to have come into play; yet many univalve and bivalve shells, such as volutes, cones, scallops, etc., are beautifully coloured and shaped. The Descent of Man The higher groups of the Mollusca are also largely represented in the Upper Silurian. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Not only has this amount of elevation taken place within the period of existing Mollusca and Cirripedes; but their proportional numbers in the neighbouring sea have in most cases remained the same. Geological Observations on South America Page 130 The last and highest group of the Mollusca—that of the Cephalopoda—is still represented only by Tetrabranchiate forms; but the abundance and variety of these is almost beyond belief. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The external integument of most of the Mollusca, which is largely developed, and forms a cloak in which the viscera are protected. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Dr. Morse has lately discussed this subject in his paper on the 'Adaptive Coloration of Mollusca,' 'Proc. The Descent of Man The lower groups of the Mollusca are abundantly represented in the marine strata of the Carboniferous series by Polyzoans Fig. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science M. d'Orbigny has been so obliging as to name for me the twenty species of Mollusca embedded in the two gravel beds: they consist of:— 1. Geological Observations on South America Coming to the Mollusca, the Polyzoans, numerous Fig. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science All the remaining Cambrian fossils which demand any notice here are members of one or other division of the great class of the Mollusca, or "Shell-fish" properly so called. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science These characters absent in the lowest classes—Brilliant colours—Mollusca —Annelids—Crustacea, secondary sexual characters strongly developed; dimorphism; colour; characters not acquired before maturity—Spiders, sexual colours of; stridulation by the males—Myriapoda. The Descent of Man The Pliocene formations contain from 40 to 95 per cent of existing species of Mollusca, the remainders belonging to extinct species. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Besides the Mollusca, the Red Crag contains the ear-bones of Whales, the teeth of Sharks and Rays, and remains of the Mastodon, Rhinoceros, and Tapir. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The lower division of the Mollusca, comprising the Polyzoa, Tunicata, and Brachiopoda. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Of the higher groups of the Mollusca the record is as yet but scanty. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science These characters are absent in the lowest classes—Brilliant colours— Mollusca—Annelids—Crustacea, secondary sexual characters strongly developed; dimorphism; colour; characters not acquired before maturity— Spiders, sexual colours of; stridulation by the males—Myriapoda. The Descent of Man A class of the Mollusca which swim by means of fins attached near the head. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Applied to the respiratory tubes in the Mollusca; also to other tubes of different functions. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The shell of Mollusca, which are for this reason sometimes called "Testacea;" also, the calcareous case of Echinoderms; also, the thick leathery outer tunic in the Tunicata. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science The remaining Lower Silurian groups of Mollusca can be but briefly glanced at here. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science They belong to the Mulluscoida of Huxley—a lower division of the great kingdom of the Mollusca; but they have recently been placed by some naturalists amongst the Vermes or worms. The Descent of Man Applied to the shells of Foraminifera and Mollusca. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science From the foregoing it will be gathered that one of the most important points in connection with the Triassic Mollusca is the remarkable intermixture of Palæozoic and Mesozoic types which they exhibit. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Hancock, A., on the colours of the nudibranch Mollusca. The Descent of Man Coming to the Mollusca, we note the occurrence of the same great groups as in the Lower Silurian. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Mollusca, beautiful colours and shapes of; absence of secondary sexual characters in the. The Descent of Man |
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