MK. A. H. GARBOD ON THE BRATN OP THE SUMATRAN RHINOCEROS. 413 



The fissure of Sylvius forms an open angle, at the bottom of which are situated a 

 number of small convolutions radiating from a point, which I take to be the island 

 of Reil. 



The under surface of the brain exhibits the smooth surfaces of the middle lobes of 

 the hemispheres and the smooth broad roots of the equally broad olfactory nerves, 

 which are not lobate at their anterior extremities. The optic chiasma is short, the 

 two optic nerves springing from its anterior surface quite close together. The pons 

 Varolii is not large, the reverse being the case with the crura cerebri and the corpora 

 albicantia. 



The lateral lobes of the cerebellum are small compared with the median portion, as 

 is the case in the Ungulata generally. 



DESCRIPTION OF PLATE LXX. 



Brain of Ceratorhinus sumafrensis. 



Fig. 1. Lateral view of right cerebral hemisphere. 



2. Inferior view of left half of brain. 



3. Superior view of left half of brain. 



4. Internal view of right cerebral hemisphere. 



