NERVOUS SYSTEM. VERTEBRATA. 



367 



The mesial surface of the brain exhibits features corpus 

 callosum, hippocampus, hippocampal fissure, the bifurcated 

 calcarine sulcus, and the separate intercalary sulcus the 

 almost exact parallel of which is exhibited by the brain of 

 the Aye-aye (compare figs. 212 and 209). 



Fig. 210. (Nat. size.) 



.OLF. BULB. 



SULC. RECT. 



-SULC.P. LAT. 



Fig. 211. (Nat. size.) 



SULC. P. LAT. 



SULC. LAT (INT. PAR) 

 Y 



OLF BULB. 



FLOC. 



SDLC. PAR. (P.SY.L) 



Upon the external aspect of the hemisphere there is an 

 interesting modification of the primitive type represented 

 by Daubentonia (in common with most mammals, such as 

 the Carnivora, Ungulata, and the Sloths). In the latter the 

 suprasylvian and postsylvian sulci are joined to form one 

 arc, whereas in the Primates there is a complete separation 

 of the postsylvian sulcus from the suprasylvian, and the 



