PLATE LVII6. 



Phenacodue primaevus Cope. Part of an entire skeleton represented on plate LVUe. Page 435. 



Fig. 1. Skull, natural size, from below. 



Figs. 2-6. — A cast of the brain cavity of the above skull, natural size. 



Fig. "2. — Lateral view; a, superior; 6, inferior; c, anterior, and d, posterior views. 



