PLATE L 



Described 

 on Page 



Fig. 1. Eporeodon socialis Marsh. Superior view of endocranial 



cast. Cat. No. 13118a Y.P.M. 263 



Fig. 2. Same as Fig. 1. Inferior view. 



Fig. 3. Promerycochoerus superbus (Leidy) . Lateral view of endo- 

 cranial cast. Cat. No. 11002 Y.P.M. 265 



Fig. 4. Same as Fig. 3. Inferior view. 



Natural size 



(Drawn under supervision of Professor Marsh) 



410 



