英语词汇“Limulus”造句的方法、技巧、例句及翻译-英语例句辞典

When it’s over, the beach is littered with the helmet-shaped carcasses of Limulus polyphemus and trillions of its greenish eggs. Millions of horseshoe crabs spawn on the shores of Delaware Bay each year. Here’s how to see them. 2018-04-26T04:00:00Z

But we should address the fundamental long-term threat to Limulus polyphemus and all life on Earth, a peril confirmed by research to the satisfaction of 97 percent of climate scientists. Opinion | To save horseshoe crabs, fight climate change 2017-07-10T04:00:00Z

In 2016, the International Union for Conservation of Nature changed the status of Limulus polyphemus from “lower risk” to “vulnerable.” This creature has 10 eyes, legs that chew and blood that saved your life 2017-07-03T04:00:00Z

The current populations of Limulus must overcome extraordinary challenges if they are to continue to make a place for themselves in a rapidly changing world. Opinion | The Planet Can’t Stand This Presidency 2017-04-21T04:00:00Z

General anatomy of the brain.—Internal structure and histology of the brain.—Comparison of the Limulus brain with the brain of other arthropods... Scientific American, Vol. XLIII.?No. 1. [New Series.], July 3, 1880 A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures 2012-01-05T03:00:30.823Z

The absence of such renal caeca in Limulus and their presence in the terrestrial Arachnida is precisely on a parallel with their absence in aquatic Crustacea and their presence in the feebly branchiate Amphipoda. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of"

Moreover, there is a significant agreement in the character of the spermatozoa of Limulus and Scorpio. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The blood contains the usual amoeboid corpuscles, and a diffused colouring matter—the haemocyanin of Fredericque—which has been found also in the blood of Helix, and in that of the Arthropods Homarus and Limulus. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics"

When I first met a horseshoe crab, technically Limulus polyphemus, on a New Jersey beach many decades ago, my 3-year-old mind sympathized with what appeared to be the animal’s struggle to find water. Opinion | The Planet Can’t Stand This Presidency 2017-04-21T04:00:00Z

A name of the Limulus polyphemus of the shores of America, where from its shape it is called the horse-shoe or lantern crab. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc.

It is interesting to note that he treats Limulus as an Arachnid, pointing out that there is as much difference between Apus and Limulus as between Cancer and Phalangium. Form and Function A Contribution to the History of Animal Morphology

There is some reason to admit the existence of another more anterior pair of these muscles in Scorpio; this would make the number exactly correspond with the number in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

This crustacean, Limulus polyphemus, is still seen on the strands of New England. Voyages of Samuel De Champlain — Volume 02

They are supposed by Professor Owen to be the trails of more than one species of articulate animal, probably allied to the King Crab, or Limulus. The Student's Elements of Geology

Never since the days of his Limulus ancestry had any of his ascendants thought thus. The Education of Henry Adams

One is the Limulus or "king-crab," which seems to be a descendant, or near relative, of the Trilobite, and has survived until modern times. The Story of Evolution

Caeca and ducts of Scorpio not represented in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The lateral eyes of Scorpio consist of groups of separate small lenses each with its ommatidium, but they do not form a continuous compound eye as in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

It shows in Scorpio and Limulus a tendency to segregate into minor groups or “ommatidia.” Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Neither in the Limulus nor in the Terebratula , nor in the Cestracion Philippi ,any more than in the Pteraspis, could one conceive an ancestor, but, if one must, the choice mattered little. The Education of Henry Adams

The most important difference which exists between the structure of Limulus and that of Scorpio is found in the hinder region of the alimentary canal. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

And it must be remembered that such forms must be expected to exhibit, when found, differences from Limulus and Scorpio as great as those which separate Apus and Cancer. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The mouth is relatively smaller in Scorpio than in Limulus—in fact is minute, as it is in all the terrestrial Arachnida which suck the juices of either animals or plants. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

In regard to the important structures concerned with the fertilization of the egg, Limulus and Scorpio differ entirely from one another. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Differences between Limulus and Scorpio.—We have now passed in review the principal structural features in which Limulus agrees with Scorpio and differs from other Arthropoda. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The lateral eyes of Limulus appear to be identical in structure and position with those of certain Trilobitae. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

They had lateral eyes5 which resemble no known eyes so closely as the lateral eyes of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

All Arachnida, including Limulus, feed by suctorial action in essentially the same way as Scorpio. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Limulus agrees with the majority of the Crustacea in being destitute of renal excretory caeca or tubes opening into the hinder part of the gut. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The Roman numerals indicate the body somites and the two figures are adjusted for comparison. ce, Cerebral arteries; sp, supra-spinal or medullary artery; c, caudal artery; l, lateral anastomotic artery of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The general form and structure of their prosomatic carapace are in many striking features identical with that of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The lateral eyes are in Limulus “compound eyes,” that is to say, consist of many lenses placed close together; beneath each lens is a complex of protoplasmic cells, in which the optic nerve terminates. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The Crustacea have, in fact, three prosthomeres in the head and the Arachnida only two, and Limulus agrees with the Arachnida in this respect and differs from the Crustacea. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The central nervous systems of Limulus and of Scorpio present closer agreement in structure than can be found when a Crustacean is compared with either. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Limulus has two pairs of these, Scorpio as many as six pairs. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Their movement in an upward or downward direction in Limulus and Mygale must exert a pumping action on the blood contained in the dorsal arteries and the ventral veins respectively. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Those of Limulus were described and figured by Alphonse Milne-Edwards, but he called them merely “transparent ligaments,” and did not discover their muscular structure. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Muscular fibres connected with the suctorial pharynx are in Limulus inserted into the entosternite, and the activity of the two organs may be correlated. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The Blood and the Blood-vascular System.—The blood fluids of Limulus and Scorpio are very similar. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

This body occurs also in the blood of Crustacea and of Molluscs, but its abundance in both Limulus and Scorpio is very marked, and gives to the freshly-shed blood a strong indigo-blue tint. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

An arrangement of great functional importance in regard to the venous system must now be described, which was shown in 1883 by Lankester to be common to Limulus and Scorpio. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

In none of them are the appendages known, but in the form of the two carapaces and the presence of free somites they are distinctly intermediate between Limulus and the Trilobitae. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

It is not desirable to occupy the limited space of this article by a full description of the limbs and segments of Limulus and Scorpio. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

There is no doubt that these are parapodial or limb appendages, carrying numerous imbricated secondary processes, and therefore comparable in essential structure to the leaf-bearing plates of the second mesosomatic somite of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The simple identification of somite with somite in Limulus and Scorpio seemed to be threatened by this discovery. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

There are a number of other important points of structure besides those referring to the somites and appendages in which Limulus agrees with Scorpio or other Arachnida and differs from other Arthropoda. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

It is not surprising that with so highly developed an arterial system Limulus and Scorpio should have a highly developed mechanism for determining the flow of blood to the respiratory organs. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Thus an organ newly discovered in Scorpio was found to have its counterpart in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The posterior median process with its repetition of triangular segments closely resembles the same process in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

It is probable that we have in the metasoma of Limulus a case of the disappearance of once clearly demarcated somites. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

As in Limulus, so in Scorpio, this unexpected somite and its appendages disappear in the course of development. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Alimentary Canal and Gastric Glands.—The alimentary canal in Scorpio, as in Limulus, is provided with a powerful suctorial pharynx, in the working of which extrinsic muscles take a part. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Owing to its position it is convenient to term the somite which is excalated in Limulus and Scorpio “the praegenital somite.” Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

Limulus thus agrees with Scorpio and differs from the Crustacea, in which there are three prosthomeres—one ocular and two carrying palpiform appendages. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

VIII, The pectens of Scorpio and the first branchial plate of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

The difference between the gill-books of Limulus and the lung-books of Scorpio depends on the fact that the latter are adapted to aerial respiration, while the former serve for aquatic respiration. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"

单词	Limulus
例句	Limulus When it’s over, the beach is littered with the helmet-shaped carcasses of Limulus polyphemus and trillions of its greenish eggs. Millions of horseshoe crabs spawn on the shores of Delaware Bay each year. Here’s how to see them. 2018-04-26T04:00:00Z But we should address the fundamental long-term threat to Limulus polyphemus and all life on Earth, a peril confirmed by research to the satisfaction of 97 percent of climate scientists. Opinion \| To save horseshoe crabs, fight climate change 2017-07-10T04:00:00Z In 2016, the International Union for Conservation of Nature changed the status of Limulus polyphemus from “lower risk” to “vulnerable.” This creature has 10 eyes, legs that chew and blood that saved your life 2017-07-03T04:00:00Z The current populations of Limulus must overcome extraordinary challenges if they are to continue to make a place for themselves in a rapidly changing world. Opinion \| The Planet Can’t Stand This Presidency 2017-04-21T04:00:00Z General anatomy of the brain.—Internal structure and histology of the brain.—Comparison of the Limulus brain with the brain of other arthropods... Scientific American, Vol. XLIII.?No. 1. [New Series.], July 3, 1880 A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures 2012-01-05T03:00:30.823Z The absence of such renal caeca in Limulus and their presence in the terrestrial Arachnida is precisely on a parallel with their absence in aquatic Crustacea and their presence in the feebly branchiate Amphipoda. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" Moreover, there is a significant agreement in the character of the spermatozoa of Limulus and Scorpio. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The blood contains the usual amoeboid corpuscles, and a diffused colouring matter—the haemocyanin of Fredericque—which has been found also in the blood of Helix, and in that of the Arthropods Homarus and Limulus. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" When I first met a horseshoe crab, technically Limulus polyphemus, on a New Jersey beach many decades ago, my 3-year-old mind sympathized with what appeared to be the animal’s struggle to find water. Opinion \| The Planet Can’t Stand This Presidency 2017-04-21T04:00:00Z A name of the Limulus polyphemus of the shores of America, where from its shape it is called the horse-shoe or lantern crab. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. It is interesting to note that he treats Limulus as an Arachnid, pointing out that there is as much difference between Apus and Limulus as between Cancer and Phalangium. Form and Function A Contribution to the History of Animal Morphology There is some reason to admit the existence of another more anterior pair of these muscles in Scorpio; this would make the number exactly correspond with the number in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" This crustacean, Limulus polyphemus, is still seen on the strands of New England. Voyages of Samuel De Champlain — Volume 02 They are supposed by Professor Owen to be the trails of more than one species of articulate animal, probably allied to the King Crab, or Limulus. The Student's Elements of Geology Never since the days of his Limulus ancestry had any of his ascendants thought thus. The Education of Henry Adams One is the Limulus or "king-crab," which seems to be a descendant, or near relative, of the Trilobite, and has survived until modern times. The Story of Evolution Caeca and ducts of Scorpio not represented in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The lateral eyes of Scorpio consist of groups of separate small lenses each with its ommatidium, but they do not form a continuous compound eye as in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" It shows in Scorpio and Limulus a tendency to segregate into minor groups or “ommatidia.” Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Neither in the Limulus nor in the Terebratula , nor in the Cestracion Philippi ,any more than in the Pteraspis, could one conceive an ancestor, but, if one must, the choice mattered little. The Education of Henry Adams The most important difference which exists between the structure of Limulus and that of Scorpio is found in the hinder region of the alimentary canal. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" And it must be remembered that such forms must be expected to exhibit, when found, differences from Limulus and Scorpio as great as those which separate Apus and Cancer. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The mouth is relatively smaller in Scorpio than in Limulus—in fact is minute, as it is in all the terrestrial Arachnida which suck the juices of either animals or plants. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" In regard to the important structures concerned with the fertilization of the egg, Limulus and Scorpio differ entirely from one another. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Differences between Limulus and Scorpio.—We have now passed in review the principal structural features in which Limulus agrees with Scorpio and differs from other Arthropoda. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The lateral eyes of Limulus appear to be identical in structure and position with those of certain Trilobitae. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" They had lateral eyes5 which resemble no known eyes so closely as the lateral eyes of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" All Arachnida, including Limulus, feed by suctorial action in essentially the same way as Scorpio. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Limulus agrees with the majority of the Crustacea in being destitute of renal excretory caeca or tubes opening into the hinder part of the gut. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The Roman numerals indicate the body somites and the two figures are adjusted for comparison. ce, Cerebral arteries; sp, supra-spinal or medullary artery; c, caudal artery; l, lateral anastomotic artery of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The general form and structure of their prosomatic carapace are in many striking features identical with that of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The lateral eyes are in Limulus “compound eyes,” that is to say, consist of many lenses placed close together; beneath each lens is a complex of protoplasmic cells, in which the optic nerve terminates. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The Crustacea have, in fact, three prosthomeres in the head and the Arachnida only two, and Limulus agrees with the Arachnida in this respect and differs from the Crustacea. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The central nervous systems of Limulus and of Scorpio present closer agreement in structure than can be found when a Crustacean is compared with either. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Limulus has two pairs of these, Scorpio as many as six pairs. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Their movement in an upward or downward direction in Limulus and Mygale must exert a pumping action on the blood contained in the dorsal arteries and the ventral veins respectively. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Those of Limulus were described and figured by Alphonse Milne-Edwards, but he called them merely “transparent ligaments,” and did not discover their muscular structure. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Muscular fibres connected with the suctorial pharynx are in Limulus inserted into the entosternite, and the activity of the two organs may be correlated. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The Blood and the Blood-vascular System.—The blood fluids of Limulus and Scorpio are very similar. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" This body occurs also in the blood of Crustacea and of Molluscs, but its abundance in both Limulus and Scorpio is very marked, and gives to the freshly-shed blood a strong indigo-blue tint. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" An arrangement of great functional importance in regard to the venous system must now be described, which was shown in 1883 by Lankester to be common to Limulus and Scorpio. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" In none of them are the appendages known, but in the form of the two carapaces and the presence of free somites they are distinctly intermediate between Limulus and the Trilobitae. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" It is not desirable to occupy the limited space of this article by a full description of the limbs and segments of Limulus and Scorpio. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" There is no doubt that these are parapodial or limb appendages, carrying numerous imbricated secondary processes, and therefore comparable in essential structure to the leaf-bearing plates of the second mesosomatic somite of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The simple identification of somite with somite in Limulus and Scorpio seemed to be threatened by this discovery. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" There are a number of other important points of structure besides those referring to the somites and appendages in which Limulus agrees with Scorpio or other Arachnida and differs from other Arthropoda. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" It is not surprising that with so highly developed an arterial system Limulus and Scorpio should have a highly developed mechanism for determining the flow of blood to the respiratory organs. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Thus an organ newly discovered in Scorpio was found to have its counterpart in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The posterior median process with its repetition of triangular segments closely resembles the same process in Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" It is probable that we have in the metasoma of Limulus a case of the disappearance of once clearly demarcated somites. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" As in Limulus, so in Scorpio, this unexpected somite and its appendages disappear in the course of development. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Alimentary Canal and Gastric Glands.—The alimentary canal in Scorpio, as in Limulus, is provided with a powerful suctorial pharynx, in the working of which extrinsic muscles take a part. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Owing to its position it is convenient to term the somite which is excalated in Limulus and Scorpio “the praegenital somite.” Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Limulus thus agrees with Scorpio and differs from the Crustacea, in which there are three prosthomeres—one ocular and two carrying palpiform appendages. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" VIII, The pectens of Scorpio and the first branchial plate of Limulus. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The difference between the gill-books of Limulus and the lung-books of Scorpio depends on the fact that the latter are adapted to aerial respiration, while the former serve for aquatic respiration. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral"
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