292 



THE BRAIN OF QUADRUMANA. 



In the Capuchins, among the new world Monkeys, as well 

 as in the old world ' Dog-like ' forms, viz., the Baboons, 

 Macaques, and Monkeys proper, together with the Gib- 

 bons (which are usually regarded as the lowest of the * Man- 

 like' Apes), the Fissures and Convolutions become more 

 numerous, whilst the Cerebral Hemispheres are larger, so 

 that they now uniformly cover the whole of the Cerebellum. 

 A good notion of the mode of distribution of the Fissures 

 on the outer surface of the Hemispheres may be gathered 

 from the outline diagrammatic sketches of these parts in 



the Macaque and 

 the Gibbon (figs. 

 106, 107) ; especi- 

 ally if they are com- 

 pared with corre- 

 sponding sketches 

 of the much sim- 

 pler brains of the 

 Marmoset and the 

 Squirrel Monkey 

 (figs. 104, 105). 



In the brain of 

 the Mangabey 



FIG. 111. Brain of Mangabey, side view. (Vogt.) Some . -\-\C\ 



of the references are the same as for fig. 110. 8, Sylvian ( n g s - 1 - LU > 

 Fissure. T, Temporal Lobe, c", c, c, First, Second, and an( J a j go j n 

 Third Tiers of Temporal Convolutions. 



of the Wanderoo 



(figs. 112, 113), which is very similar, the principal primary 

 fissures of the Cerebral Hemispheres, and therefore the 

 included portions or Lobes, are quite distinct. Thus R, 

 represents the ' fissure of Rolando ' which separates the 

 Frontal from the Parietal Lobe; s, is the 'fissure of Sylvius/ 

 constituting the upper boundary of the Temporal Lobe, 

 and separating it from the Parietal ' ; v, is the vertical or 

 * perpendicular fissure ' which is obvious on the inner as 



