THE BRAIN. 



Fig. 1i. 



65 



Figure 74. — Mastodon Amerkanus, Cuvier. Tliocene. 



Figure 'ih.—Elotherium crassum, ^larsh. Miocene. FiGCRE 76.— /'.W^^/yomw cowy)»«™s, LeConte. Pli. 



