File:Image from page 229 of "Water reptiles of the past and present" (1914) (14586611067).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: nd ponds, and becamealmost as thoroughly aquatic in their thin shape and soft covering;and their lineal descendants still continue in the rivers of theNorthern Hemisphere. Still others, in the Age of Mammals, tookto the upland, and competed with the mammals in the open placesand prairies, reaching their maximum in Miocene-Pliocene times,when for some unknown reason the giants among them were drivenfrom the mainlands to continue a precarious existence to the presenttime in some of the larger islands. Were there no turtles living we should look upon the fossilforms as among the strangest of all vertebrate animals—animals 2l8 WATER REPTILES OF THE PAST AND PRESENT which had developed the strange habit of concealing themselvesinside of their ribs, for that is literally what the turtles do. Thebox or shell of an ordinary turtle is composed of the backbones andribs, to which are soldered a shell of bony skin plates above, withthe clavicles, interclavicle, and ventral ribs below. Except in

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