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 theinfundibulura. The hypophysis cerebri is 

 very large. The anterior commissure is distinct, but not particularly 



Y'lOr. 2. 



Brain oi 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- 



