File:Image from page 184 of "Water reptiles of the past and present" (1914) (14586407359).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: d from geological history; and itis also a curious fact that such vertebraeappear to have originated only among animalscrawling on land, so that they would nothave been a character acquired by the thalattosaurs after descend-ing into the water. It will be seen from the figure of a dorsalvertebra that the rib was attached by a single articular surface,almost exclusively to the body of the vertebra, quite like thoseof all lizards, snakes, and mosasaurs, and unlike those of otherreptiles. This too may seem to be a trivial character to proverelationships with the lizards, but it is a curious fact that no twoanimals having different kinds of ribs are closely related to eachother. Possibly, however, this looser mode of attachment of theribs in the thalattosaurs was one of their peculiar adaptations to awater life, and may not have been derived from their land ancestors.Of the limbs, only a few bones are known, but these are veryinstructive. The arm bones, as shown in Fig. 84, are strikingly

Text Appearing After Image: Fig. 83.—Dorsal ver-tebra of Thalattosaurus.(After Merriam.) J74 WATER REPTILES OF THE PAST AND PRESENT


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