THE BRAIN. 



61 



FlGtTHE 63. — Outline of skull of Dinoceras mirabile, Mur^h; with cast of liraiu-cavity iu positiou- about one- 



cifrlitli natural size. Eocene. 

 FiGCiiE Gl — Outline of skull of Brontotherimn ingeiis. Marsh; witli cast of lirain-ra\ity in fiosiiioii; one tenth 



r.atural size. Miocene. 

 KiouUE R.'i.-^Outline of skull of horse, £^««.5 cabalhis, Lincaiis; with cast of brain-cavity in position; about 



one-sixth natural size. Recent. 



