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: 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.

Text Appearing After Image: Fig. 10.—Mandible of Labidosaurus, a cotylosaur reptile: A from within; B fromwithout. The coronoid (cor) is a single bone, but extends far forward. The splenial(sp) is also a single bone, replacing the two of the amphibians. The prearticular (pa)is narrower, and the angular (ang) appears broadly on the inner side. The dentary (d)is much larger and the surangular (sa) is distinct. The articular (art) is small. THE SKELETON OF REPTILES 27

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