DINOCERATA. 



Brain-cast of Dixoceras mirabilk, Marsh. 



Three-fourths Natural Size. Page. 



Fig. 1. — Cast of Brain-cavity ; lateral view, seen from the left, 53 



P'iG. 2. — The same ; superior view, _ 54 



Fig. rs. — The same ; inferior view, 55 



oi or I- — Olfactory lobes, 

 c — Cerebral hemispheres. 

 s — Sylvian fissure. 

 op or II- — Optic nerves. 

 F" — Trigeminal, or fifth, nerve 

 F —Pituitary body. 

 f — Flocculus. 

 y — Sixth nerve. 

 eh — Cerebellum. 



cf or XII — Condylar foramen for twelfth nerve. 

 Ill — Medulla. 



