单词 | Selachii |
例句 | The formation of the brain, the gut, and the sexual organs is also the same as in the Selachii. The Evolution of Man — Volume 2 The skeleton is soft, cartilaginous, and at a low stage of development, as in the lower Selachii and the earliest Ganoids. The Evolution of Man — Volume 2 The two pairs of limbs are very simple fins of a primitive type, like those of the lowest Selachii. The Evolution of Man — Volume 2 Comparative anatomy and ontogeny show clearly that the Ganoids descended from the Selachii, and the Teleostei from the Ganoids. The Evolution of Man — Volume 2 From the primitive fishes or Selachii, the earliest Gnathostomes, was developed the legion of the Ganoids. The Evolution of Man — Volume 2 All these essential parts of the middle ear originate from the first gill-cleft and its surrounding part; in the Selachii this remains throughout life an open squirting-hole, and lies between the first and second gill-arch. The Evolution of Man — Volume 2 Some of these fossil Ganoids approach closely to the Selachii; others are nearer to the Dipneusts; others again represent a transition to the Teleostei. The Evolution of Man — Volume 2 These "eating yelk-cells" are found in large numbers in the food-yelk of the Selachii, especially in the yelk-wall—the border zone of the germinal disk in which the embryonic vascular net is first developed. The Evolution of Man — Volume 2 The foremost section, which is turned towards the ventral side, and from which the aortic arches rise, reproduces the arterial bulb of the Selachii. The Evolution of Man — Volume 2 At first the whole of the mouth was armed with these cutaneous teeth in the Selachii and in the earliest amphibia. The Evolution of Man — Volume 2 For our genealogical purposes the most interesting are the intermediate forms between the Selachii and the Dipneusts. The Evolution of Man — Volume 2 It is still found in many of the Selachii and Amniotes. The Evolution of Man — Volume 2 It is the same with the cutaneous teeth or placoid scales of the Selachii. The Evolution of Man — Volume 2 In the Selachii an arterial cone is developed from the foremost end of the ventricle, as a special division, cut off by valves. The Evolution of Man — Volume 2 |
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