File:Image from page 151 of "Water reptiles of the past and present" (1914) (14586383839).jpg
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[edit]DescriptionImage from page 151 of "Water reptiles of the past and present" (1914) (14586383839).jpg |
Identifier: waterreptilesofp1914will Title: Water reptiles of the past and present Year: 1914 (1910s) Authors: Williston, Samuel Wendell, 1851-1918 Subjects: Aquatic reptiles Publisher: Chicago, Ill., The University of Chicago Press Contributing Library: Boston Public Library Digitizing Sponsor: Boston Public Library
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Text Appearing After Image: Fig. 65.—Iguana. (By permission of the New York Zoological Society) lizards, like the glass snakes and the amphisbaenas, or slow lizards,which are quite legless and there are some snakes which have smallbut functionless hind legs. As usual, more important differencesare found in the skull. The brain-case in all snakes is surroundedon all sides by bone, for the better protection of the brain, with thehead resting quite prone on the ground. The brain of the lizards,for the most part, is protected on the sides and in front by a simplemembrane. Nearly all lizards have movable eyelids, while snakesdo not; snakes have a single lung, and a protrusible tongue, whichvery few lizards possess; and the lower jaws in front are unitedin the snakes by a ligament only. Notwithstanding these differ-ences, the snakes and lizards are closely related animals, and must SQUAMATA 141 have come from a common ancestry; among all reptiles the knowngeological history of the snakes is shortest. Lizards, on the
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Source | Image from page 151 of "Water reptiles of the past and present" (1914) |
Author | Internet Archive Book Images |
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