THE BRAIN OF QUADRUMANA. 



the Frontal Lobes are short and shallow, though as a whole 

 its upper outline is decidedly convex. The lower and 

 hinder boundary of the Cerebral Hemisphere, when com- 

 pared with the corresponding region in Man, is notable for 

 its concavity and slanting direction from behind forwards. 

 This is due to the marked shallowness of the Occipital 



FIG. 11,1 Brain of the Chimpanzee, upper aspect, with upper part of Right 

 Hemisphere cut away so as to expose Lateral Ventricle. (Vogr, after Marshall.) 

 Letters of reference for Left Hemisphere similar to those of fig. 110. c s, Corpus 

 Striaturn, iu the anterior cornu of the Ventricle ; c a, Hippocampus Major, in the 

 descending cornu ; h m. Hippocampus Minor, in the posterior cornu. 



Lobes in the Chimpanzee these divisions of the Brain 

 being wide but not deep. The same peculiarity is to be 

 seen in the brain of the Orang (fig. 121). 



The Frontal Lobes in the Orang have a recurved beak- 

 like termination (seen also in fig. 121) ; and if we turn the 



