File:Image from page 210 of "Water reptiles of the past and present" (1914) (14750068006).jpg

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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 Before Image: column bytwo sacral vertebrae. The collar-bones, or clavicles, are wanting in crocodiles; thereis a slender interclavicle; and the shoulder-blade and coracoid arewell developed (Fig. 102). The bones of the pelvis are looselyunited with each other as they are in most reptiles (Fig. 104). Thepubes, the anterior bones below, unlike those of all other reptiles,do not help to form the acetabulum or socket for the articulation ofthe thigh bone, nor do they articulate with each other. Thissingle character sharply distinguishes a crocodile from all otherreptiles, living or extinct, and is almost the only character that CROCODILIA 199 separates the order from the dinosaurs, aside from the peculiarstructure of the nasal passages in the skull. On the under side ofthe body, connected with the front end of the pubes, there are sevenor eight pairs of abdominal ribs, corresponding to the plastron ofthe turtles and similar to those of the ichthyosaurs and plesiosaurs.The mosasaurs have no such ribs.

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Source Image from page 210 of "Water reptiles of the past and present" (1914)
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