292 | MR. W.A. FORBES ON THE GREAT ANTEATER. [Mar. 7, 
The pineal gland has a distinct hard mineral deposit ; its peduncles 
are easily made out. , 
There is no very distinct corpus mamillare, it being only represented 
by a white swelling on the infundibulum. The hypophysis cerebri is 
very large. The anterior commissure is distinct, but not particularly 
Brain of Myrmecophaga jubata (specimen a) from above. 
large, its antero-posterior extent being °15 inch. The soft com- 
missure is very large (‘25 inch long) ; the posterior distinct. The 
third nerves are small, the optic not large. 
There is a good septum lucidum (*25 inch deep anteriorly), with a 
contained fifth ventricle. The fornix is very well developed, with 
but few precommissural fibres. The corpus callosum is very well 
developed, more than an inch long, and nearly horizontal in position, 
with but a slight genu anteriorly. Posteriorly it forms, with the 
fornix, a prominent pad (bourrelet). 
The cerebral sulci are not exactly alike in my two specimens, the 
brain of the bigger of the two animals, though of the same dimen- 
