OCR Text |
Show 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 commissure 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 (bourrelei). The cerebral sulci are not exactly alike in m y two specimens, the brain of the bigger of the two animals, though of the same dimen- |