CORYPHODONTID^. 



177 



Genus CORYPHODON, Owen l . 



This is that type genus, and is represented by numerous species in 

 the Lower Tertiaries of Europe and North America. As defined by 

 Cope, it is characterized by the presence of a posterior V on the cro w 

 vof the upper true molars, and by the astragalus being transversely 

 extended with an inner hook but no facet. The cranium of one of 

 the American species is figured in the accompanying woodcut (fig. 27). 



Fig. 27. 



Coryphodon elephantopus, Cope. Cranium viewed from the palatal aspect ; 

 from the Wasatch Eocene of New Mexico, U.S.A. -f . (From the Amer. Nat.) 



1 British Fossil Mammals and Birds, p. 299 (184(5). 



