OCR Text |
Show 1895.] BBAIN IN THE LEMUES. 145 join or nearly join above. There are faintly marked parietooccipital fissures. Brain oi Perodicticus potto. A, dorsal, B, ventral aspect; p.s., presylvian fissure; other lettering as in fig. 1. § The Brain of Loris gracilis. (Fig. 3.) The description of this little brain will not detain us long, as it is, with the exception of Cheirogaleus, the simplest form of Lemur's brain known to me. It is very rounded in form, a character which also distinguishes Cheirogaleus. Fig. 3. Brain of Loris gracilis. Lettering as in fig. 1. There are only three fissures plainly visible-the Sylvian, the angular, and the antero-temporal. The angular fissure is of moderate dimensions and is curved, the concavity being outwards. The other fissures call for no particular comment. On one side of the brain of one of the two specimens which I have is a very short parieto-occipital fissure. I would point out, in criticism of the use of intra-cranial casts, how totally m y figure differs from P E O C . Z O O L . Soc-1895, N o . X . 10 |