File:Image from page 166 of "Water reptiles of the past and present" (1914) (14770686964).jpg
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DescriptionImage from page 166 of "Water reptiles of the past and present" (1914) (14770686964).jpg |
English: 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
Click here to view book online to see this illustration in context in a browseable online version of this book.
Text Appearing After Image: Fig. 72.—Skulls of mosasaurs. Upper figure, Clidastes, from the side; middlefigure, Platecarpus, from below; lower figure, Tylosaurus, from above: an, angular;bs, basisphenoid; c, coronoid; ep, epipterygoid; fr, frontal; j, jugal; I, lacrimal; m,maxilla; na, nasal; oc, occipital condyle; pa, parietal, palatine; pm, premaxilla;pf, prefrontal; pt, pterygoid; po, postorbital; q, quadrate; sp, splenial; sq, squa-mosal; Ir, transverse; v, vomer. dilated more or less toward the free end, that is, with the beginningof a terminal caudal fin, such as the more specialized ichthyosaursand crocodiles possessed. The vertebrae were procoelous, that is, 156 WATER REPTILES OF THE PAST AND PRESENT concave in front and convex behind, like those of most modernlizards and all modern snakes and crocodiles, but quite unlike thebiconcave vertebrae of all other aquatic reptiles. This kind ofarticulation of the backbones gave greater firmness and strengthto the spinal column, but decreased the flexibility,
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Source | Image from page 166 of "Water reptiles of the past and present" (1914) |
Author | Internet Archive Book Images |
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