160 



MR. F. E, BEDDARD ON BRAINS 



[Jan. 19, 



which he letters " see.," and believes to coiresppncl to the fissure 

 of Rolando, is " obviously formed by a blending of the svxlcus f 

 of the Lemurs with a sulcus such as I called x in Nyclicehus" 

 That fissure (" see.") is plainly visible in my specimen. I am, 

 however, a little inclined to comjjlain 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 "«" with the ti'ansversely running- 

 portion of the fissure "/," 



Arteries of Brain. 



I have been able to compare injected biuins of the Potto, Lemur 

 coronatus, and a young Lemur 7naccico 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; t-a. points to both carotid and com- 

 missural artery uniting branches of basilar artery ; cc., 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 ariangement of the arteries in a few 

 Primates with special reference to the Lemui-s. Tandler has 

 studied these arteries in a few Primates (besides other mammals), 

 but not in the species studied by myself. He figures Lemur 



