Er 
Brain of the Mastodon giganteus. 53 
apex directed forwards and in a great measure overlapping the 
olfactory lobes. This conical portion terminates at the posterior 
edge of the wing of the sphenoid, which forms the boundary be- 
tween the orbitar and middle cranial fosse. Behind this division 
the brain becomes suddenly increased in breadth from 7} inches, 
which it is at the division, to 104, which is its diameter through 
its broadest part. , , 
i 
r MASTODON. 
Explanation —, Olfactory lobes.—II. Cerebral Hemispheres.—llI. Cerebellum.—IV- 
Medulla oblongata.—The game numbers refer to the same parts in all the figures. 
