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Show 160 MR. P. E. REDDARD ON BRAINS [Jan. 19, which he letters " see." and believes to correspond to the fissure of Rolando, is " obviously formed by a blending of the sulcus/ of the Lemurs with a sulcus such as I called x in Nycticebus." That fissure ("see.") is plainly visible in m y specimen. I am, however, a little inclined to complain of the word " obvious " in Dr. Elliot Smith's phrase, and to amend his conclusion as to homologies by suggesting that the fissure " see." of Perodicticus is formed by a blending of " x" with the transversely running portion of the fissure "/." Arteries of Brain. I have been able to compare injected brains of the Potto, Lemur coronatus, and a young Lemur macaco with those of a few species of Apes. I have amassed a considerable number of injected brains Text-fig. 13. Base of brain of Perodicticus potto. ca., additional posterior communicating artery; ca. points to both carotid and commissural artery uniting branches of basilar artery; ce., junction of middle and anterior cerebrals ; VI, sixth nerve. of various mammals which I find to present certain differences in the arrangement of the arteries. For the present, however, I confine myself to noting the arrangement of the ax-teries in a few Primates with special reference to the Lemurs. Tandler has studied these arteries in a few Primates (besides other mammals), but not in the species studied by myself. He figures Lemur |