File:Image from page 200 of "Water reptiles of the past and present" (1914) (14586425528).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: PARASUCHIA 189 related most nearlyto the crocodiles anddinosaurs, and areprobably an earlybranch of the stemfrom which they, thepterodactyls and thebirds, arose, a branchthat persisted only ashort time, geologi-cally speaking, andwent entirely out ofexistence at the closeof Triassic times,leaving no descend-ants behind. Never-theless, in thiscomparatively brieflife-span they devel-oped not a few dis-tinctive forms andbecame widely dis-tributed over theearth. Their remainsare known from theUpper Trias of Ger-many, England, andScotland, India,South Africa, andfrom Massachusetts,North and SouthCarolina, and manyplaces in the RockyMountains. No truephytosaurs are yetknown from SouthAmerica, but in all

Text Appearing After Image: Fig. 93.—Skull of Mystriosuckus, a phytosaur: pm,premaxilla; m, maxilla; na, nasal; /, frontal; p, pre-frontal; /, lacrimal; pf, postfrontal; po, postorbital;pa, parietal; sq, squamosal; qj, quadratojugal;pi, palatine; i, transverse; in, internal nares; en,external nares; pt, pterygoid; bs, basisphenoid; eo,exoccipital. (After McGregor.) 190 WATER REPTILES OF THE PAST AND PRESENT probability they will be discovered there when the Triassic depositsof that continent have been better explored for fossils. In theRocky Mountains, especially, their remains are widely scattered,they have been found in many localities in Wyoming, Colo-rado, Oklahoma, Utah, and New Mexico. Though for the mostpart their known remains from these localities are yet fragmentary,not less than four distinct genera have been described from these


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