sas, and the Tertiary of Wyoming and Colorado. Dur- 

 ing his life time over 600 vertebrate species of loose or 

 unknown definition were made known to science by Cope. 

 Among these were not only the wonderful procession of 

 Cretaceous animals of great size, but also many smaller 

 and rarer species. He secured and described from New 

 Mexico some of the oldest known American mammalia. 

 LEIDY Third and last in this order of the early great 



vertebrate Paleontologists of America was Joseph Leidy. 

 He was born September 9, 1823, in Philadelphia, Pennsyl- 

 vania, where he died April 30, 1891. Leidy 's papers cov- 

 ered a wide range in the biologic and paleontologic fields 

 extending from microscopic forms of animal life to the 

 higher and larger vertebrates. However, like his colleagues 

 Marsh and Cope his contributions of greatest length and 

 worth were those which described the Cretaceous vertebrate 

 faunas of the western United States. 

 American There are, at the present time, about forty verte- 



paleontol? brate paleontologists of acknowledged reputation in the 

 ogists. United States, and about one hundred in the world. Of 



the living American vertabrate paleontologists the follow- 

 ing are the most prominent: Henry F. Osborn, Columbia 

 University and The American Museum of Natural History; 

 William B. Scott, Princeton University; Richard S. Lull, 

 Yale University; William K. Gregory, Columbia Univer- 

 sity; William D. Matthew, American Museum of Natural 

 History; Barnum Brown, American Museum of Natural 

 History; Earl Douglass and O. A. Peterson, University of 

 Pittsburgh ; J. W. Gidley and Charles W. Gilmore, National 

 Museum; E. C. Case, University of Michigan; E. S. Riggs, 

 Marshall Field Museum of Natural History ; E. H. Barbour, 

 University of Nebraska; F. B. Loomis, Amherst College; J. 

 C. Merriam, University of California; Samuel W. Williston, 

 University of Chicago; Oliver P. Hay, National Museum; 

 Roy L. Moodie, University of Illinois Medical School; 

 L. M. Lamb, Canadian Geological Survey; F. A. Lucas, 

 American Museum of Natural History; W. J. Sinclair, 

 Princeton University; J. L. Wortman, formerly at Pea- 

 body Museum, Yale University; Walter Granger, Amer- 

 ican Museum of Natural History ; Charles R. Eastman, Har- 

 vard University, and the late J. B. Hatcher, of the Carnegie 

 Museum. 



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