File:Image from page 37 of "Water reptiles of the past and present" (1914) (14792838813).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: e articular of reptiles, it is nowgenerally believed, is represented in mammals by one of the earbones, the quadrate by another. The teeth of reptiles are of much less importance, as a rule, inthe determination of relationships than are the teeth of mammals.Rarely are their shapes of specific, and often not of generic, impor-tance, though their number and relative sizes may be. The teethof mammals, as a rule, are forty-four or less in number, and theyare always inserted in distinct sockets in the jaw bones. Amongreptiles they are indefinite in number, and may be attached toany of the bones of the palate and sometimes also to the coronoidof the mandibles. Furthermore, except in those reptiles relatedto the immediate ancestors of the mammals, they are alike ornearly alike in the jaws, that is, homodont, not distinguishableinto incisors, canines, and molars. They may be inserted inseparate sockets (thecodont), in grooves, or simply be co-ossified 26 WATER REPTILES OF THE PAST AND PRESENT

Text Appearing After Image: Fig. 9.—Mandible of Trimerorhachis, a stegocephalian amphibian, ancestrallyrelated to the reptiles: A from within; B from without. The coronoid is composedof three bones, the true coronoid (cor), the intercoronoid (icor), and the precoronoid(Pc). The splenial is composed of two, the true splenial (sp) and the postsplenial(psp). The prearticular (pa) is broad, the dentary (d) is small; and the angular (an)is only slightly visible on the inner side.


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