Cope.] ps 616 [March 16, 
On the Brain of Coryphodon, 
By E. D. Cops. 
(Read before the American Philosophical Society, March 16, 1877.) 
The charaeter of the brain in Coryphodon being an important desidera- 
tum, I endeavored to obtain a cast of the cranial cavity of a well preserved 
skull of a @. elephantopus, from the Wasatch beds of New Mexico. 
The hard sandstone matrix which filled it, was removed with some diffi- 
culty ; the more as its surfaces were indurated by a cement containing 
much iron oxide. The osseous walls were found in a good state of preser- 
vation. It was ascertained that there is a considerable foramen lacerum 
posterius, but which is not nearly of such proportionate size as that in the 
genus Tapirus. 
The form of the brain-cast thus obtained is very remarkable. Its distin- 
guishing peculiarities are, (1) the small size of the cerebellum ; (2) the large 
size of the region of the corpora quadrigemina ; (3) the small size of the 
hemispheres ; and (4) the enormous size of the olfactory lobes. 
There is in the cast a strong constriction in front of the medulla oblon- 
gata on one side, which does not exist on the other side. It is uncertain 
which represents the true form, as regards the lateral portion, but that 
there was a step-like constriction across the base of the brain at this point, 
there isno doubt. The medulla is very stout and wider than the hemis- 
pheres ; it is depressed, and a protuberance on the inferior part of each 
side has the appearance of the base of the eighth pair of nerves. The 
region of the cerebellum is depressed and does not present in the cast a 
distinct line ot demarkation from the medulla. An indication of the vermis 
is seen in a low longitudinal median protuberance. In front of this a trans- 
verse shallow depression separates it from the middle brain. 
The region of the corpora quadrigeminu is the most bulky portion of the 
