PLATE XVIII 



Described 

 on Page 



Fig. 1 . Promerycochosrus montanus grandis Douglass. Inferior 



view of skull. HT. Cat. No. 990 CM. 139 



Fig. 2. Same as Fig. 1. Superior view of mandibular rami. 



Fig. 3. Same as Fig. 1. Superior view of skull. 



One-third natural size 



(Photographs from the Carnegie Museum) 



346 



