File:Image from page 208 of "Water reptiles of the past and present" (1914) (14792938623).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: with the hind extremity of the upper jaw. The lower jawsare rigidly united in front, sometimes for a long distance; they have,almost always, a hole or opening through the hinder part, knownin but few other reptiles. The bones of the palate are all firmlyunited, forming a nearly complete roof, very unlike the conditionin the mosasaurs and lizards. The palate also is very peculiarin the development of a plate of bone below the nasal chambers,forming a complete bony canal on each side through which therespiratory air passes far back to the internal opening of the nostrils CROCODILIA 197 above the pharynx, and not, as in other reptiles—save the imme-diate ancestors of the mammals—entering the mouth at the frontend. This peculiar arrangement of the air-passages, so like that ofourselves, has much to do with the water habits of the crocodiles,as we shall see. The teeth are conical in shape, and are always restricted to theedges of the jaws, above and below. They are inserted deeply and

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