PROSENCEPHALON OF MAMMALS. 



131 



sylvian, 12, coronal, 13, lambdoidal, U, frontal, 14 , superfrontal, 

 u", mid-frontal, 17', exoccipital, and 17*, postoccipital. The folds 

 arc : — e, sylvian, /, medial, m, medilateral, n, postfrontal, n! ' } 



116 



Infant, 7 mo. 



3 9 



9 



Foetus, 3 nio. Lemur. 



Chimpanzee. 



Homo. 



superfrontal, n" 9 midfrontal, n'" ', subfrontal, o, ectorbital, p 9 

 lambdoidal, q, occipital, q", suroccipital, q'", suboccipital. 



The primary fissures on the internal (mesial) surface of the 

 hemisphere, fig. 118, are 4, hippocampal, with its long bifurcate 



Vertical section, brain of Baboon. 



posterior extension, 4 r , 7, callosal, 7' ', supercallosal, 6, marginal, 1 

 13', entolambdoidal, here continued into the posthippocampal ; the 

 supercallosal fissure, 7', bifurcates anteriorly, as mPapio, fig. 117, 

 f and Pithecus (vol. ii. fig. 149). The surface applied to the 

 fore part of the falx is impressed by falcial, 15, and subfalcial, is', 



1 This is seldom so distinct or continuous as in the larger ungulates. 



K 2 



