File:Image from page 38 of "Water reptiles of the past and present" (1914) (14586320759).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. 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

Text Appearing After Image: g c +> as^ cj E OS ^ ,3 o r3 o 2^3 ja M ts .Sg5 -3 -1 to the surface of the bone (acrodont). And they are usuallyreproduced indefinitely by new teeth growing at the side of thebase or below them. More usually theyare pointed and curved; sometimes theyare flattened, with sharp cutting edgesin front and behind in the more strictlycarnivorous reptiles; in those of her-bivorous habits they are more dilatedand roughened on the crown, notpointed; in not a few they are low,broad, and flat and are used only forcrushing the hard shells of invertebrates.With the very few exceptions amongcertain dinosaurs, they never have morethan one root for attachment. Theevolutional tendency for reptiles, as forthe mammals, is to loose teeth, especiallythose of the palate. Among living rep-tiles it is only the most primitive types,such as the lizards, snakes, and thetuatera, which have teeth on the palatalbones, and in none are there teeth onthe vomers, as was the rule in the ancientreptiles. The lizards


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Source Image from page 38 of "Water reptiles of the past and present" (1914)
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