EXPLANATION OF PLATE 30. 



Figures reproduced three-fourths natural size. 



Pig. 1. — Hyaenognathus? (Porthocyon n. gen.?) dubius n. sp. Inferior 

 side of the cranium. 



Fig. 2. — Canis indianensis Leidy. Inner side of the left ramus of the 

 mandible. The partial outlines of P 5 and Pj are drawn from 

 impressions in the matrix. The length of the jaw is slightiy 

 exaggerated. 



