File:Image from page 208 of "Water reptiles of the past and present" (1914) (14586363110).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 After Image: Fig. 9g Fig. 100 Fig. 99.—Skull of Alligator mississippiensis, from below. Fig. 100.—The same, from above: bo, basioccipital; bs, basisphenoid; /, frontal;j, jugal; /, lacrimal; m, maxilla; 11, nasal; p, parietal; pa, palatine; pm, premaxilla;pf, prefrontal; pr, postfrontal; pt, pterygoid; q, quadrate; qj, quadratojugal; tr,transverse. firmly in sockets, and are replaced frequently by new ones growingbeneath them, pushing the older ones out as their usefulness becomesimpaired by injury or by use. In some species there are as many asthirty teeth in each side of the jaws, above and below, although thebroad-headed kinds have a smaller number. The neck is short, as has been stated, but it always includesin living forms nine vertebrae, a number probably slightly in excessof that of their terrestrial forbears. By the peculiar mode of 198 WATER REPTILES OF THE PAST AND PRESENT attachment of the short hatchet-shaped ribs, much lateralmovement of the neck is prohibited, nor is any very gre


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