THE BRAIN. 



57 



Fig. 6:. 



\^ 



FlGTTRS GI. — Cast of brain-cavity of Uintatherium ruluetura, Leidy; lyije .-ipeci.uuii, la(,(.i;il w'xaw. 

 Figure 62. — The same ; superior view. 



c. cerebral hemispheres; ch. cerebellum; /. Hoceulus; m. medulla; ol. olfactory lobes; op. optic nerves; 



V. fifth nerve ; XII. twelfth nerve. 



Both figures are three-fourths natural size. 



Brain Growth. 



The Dinocerata are, by far, the hiro-est of all known Eocene land 

 animals, and that they have, also, a very diminntive l)raiii is a noteworthy 

 fact, which attracted the aratlior's attention soon after their discovery. 



