SCIENCE OF FOSSIL LIFE 337 
Leidy, Cope, and Marsh.—Among the early explorers of 
the fossils of the West must be named Joseph Leidy, E. D. 
Cope (Fig. 100), and O. C. Marsh. These gentlemen all 
had access to rich material, and all of them made notable 
contributions to the science of paleontology. The work of 
Fic. ro1r.—O. C. Marsu, 1831-1899. 
Cope (1840-1897) is very noteworthy. He was a compar- 
ative anatomist equal to Cuvier in the extent of his knowl- 
edge, and of larger philosophical views. His extended publi- 
cations under the direction of the United States Government 
have very greatly extended the knowledge of fossil vertebrate 
life in America. 
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