CORYPHODON. 525 



awkward, from the inflexibility of the aukle. But, in compensation for the 

 probable lack of speed, these animals Avere most formidably armed with 

 tusks. These weapons, particularly those of the upper jaw, are more robust 

 than those of the Carnivora, and generally more elongate, and attrition pre- 

 served rather than diminished their acuteness. The size of the species 

 varied from that of a Tapir to that of an Ox. 



There is no evidence that these animals possessed a proboscis, as was 

 probably the case with some of the Dlnocerata. 



We must suppose that the Coryphodons were vegetable feeders, but 

 not restricted to any particular class of food. They were doubtless, to a 

 large extent, like the hogs, omnivorous. 



Position. — The genus Corypliodon is characteristic of the Lower Eocene 

 formation in North America and Europe. In the former country it is con- 

 fined to the Wasatch and Wind River epochs; in Europe, to the Suessonian 

 and, perhaps, the Thanetiau of France and England. It is absent from the 

 Upper Eocene of both countries. 



CORYPHODON CUSPIDATUS CopC. 

 Report U. S. Geol. Survs. "W. of 100th Meridian, iv, i)t. ii, p. 206, pi. xlvi, fig. 1. 



This species is well characterized by the strong additional cusp found 

 on the inner side of the crown of the last inferior molar between the interior 

 extremities of the transverse crests. To give it more place, the posterior 

 crest is more oblique than in other species. The accessoiy cusp is repre- 

 sented by a crest in the C. eoccenus, and the New Mexican C. ohliquus. 



The typical specimen, including only a fractured last molar with a 

 supporting fragment of the jaw, was found by myself in New Mexico. A 

 second specimen was found by my assistant, Mr. J. L. Wortman, in the 

 bad lands of the Big Horn Valley, Wyoming. It includes, however, only 

 some jaw fragments with three inferior premolars, and two entire and two 

 broken inferior true molars. These indicate a species of smaller size than 

 the Batlmiodon radians, and agree with the typical specimen above men- 

 tioned The molars preserved, excepting the posterior, do not differ mate- 

 rially from those of other species, excepting the O. latidens, which is peculiar. 



