152 



BULLETIN OF THE 



Hyaenodon leptocephalus, Scott.* This species is peculiar for the long, 

 narrow cranium, and for the position of tlie posterior nares, which are roofed in 

 by the entire length of the palatines and by the pterygoid plates of the alis- 

 phenoid. In size it slightly exceeds the H. crucians of Leidy. This species 

 was established upon two fine skulls in the Cambridge collection. 



Figure 1. — Skull of ITycenodon leptocephalus, from below upon the under surface. 



CARNIVORA. 



CANID^. 



Cynodictis (Amphicyon) gracilis, Leidy. With the possible exception 

 of some specimens from the Uinta eocene, the genus Amphicyon has not been 

 found in America. Galecynus, as has been lately shown, f cannot be separated 



* Lnc. cit. 



+ Huxley, P. Z. S., 1880, p. 280 ; Lydekker, Brit. Mus. Cat. Foss. Mam., Vol. I. 



