File:Image from page 145 of "Water reptiles of the past and present" (1914) (14770674434).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: Fig. 62.—Life restoration of Araeoscelis; about one-fourth life size it, at least so far as the form is concerned. The skull has a single,upper temporal opening, quite like that of lizards, but the quadrateis not loose below. And this is really what we should expect inthe ancestral lizards; and everything else of the skeleton, exceptperhaps one character, is what would be expected. That onecharacter is the elongation of the cervical vertebrae, which are 134 WATER REPTILES OF THE PAST AND PRESENT

Text Appearing After Image: ~. tA ii: / r Fig. 63.—Skeleton of Pleurosaiims. (After Lortet) PROTOROSA URIA 135 about twice the length of the dorsal vertebrae following them.The cervical ribs are very slender bones, articulating by a singlehead with the centrum only. In these and other characters, sofar as they are known, Araeoscelis seems to agree with Protorosaurus,and both have very hollow bones. PLEUROSAURUS We may for the present be justified in maintaining the orderProtorosauria for those reptiles having a single, typically uppertemporal opening on each side, with a fixed quadrate, not includ-ing the ichthyosaurs. It is not improbable, however, that whenmore is known of the ancestors of the lizards, the whole group willfind its most natural place among the Squamata. This definitionwill include a peculiar aquatic reptile that has been known formany years, but which has been wrongly classed in the same familyas Sphenodon, on the purely gratuitous assumption that it has twotemporal openings on each side; we


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Source Image from page 145 of "Water reptiles of the past and present" (1914)
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