E. L. Troxell — Entelodonts in Marsh Collection. 435 



P 3 is pyramidal, very angular, but rounded on the outer 

 side ; it is doubly convex, narrow on the anterior end, and 

 very wide posteriorly. It is much pitted on the inner and 

 back surfaces, with a strong ridge on the former, and on 



Fig. 16. — Hegachoerus zygomaticus, gen. et sp. nov. Genoholotvpe. Cat. 

 No. 10008. Palatal view. One-fifth nat. size. 



the rear outer corner, but no posterior heel. Below the 

 cingulum there is a smooth enamel band around the base. 

 Premolar four in its general form bears resemblance to 

 no other genus present : three sides form right lines, but 

 the inner is curved; especially important is the absence of 



