120 



P.Z.S. 1880, 

 p. 642. 



ON THE UAKAEI MONKEYS. 



Fi. 7, 



Brain of Bed TJakari, seen from above. 

 Fig. 8, 



Bight half of the same, seen from below. 



P.Z.S. 1880, the " sulcus (4) bounding the upper border of the angular gyrus, having 

 p. 641. the form of a broad pointed arch," described by Prof. Flower in Pithecia 



monachus (I. c. p. 330). A comparatively slight modification of the con- 

 dition of these parts in that species as represented in his fig. 1 would 

 bring about that \vhich obtains in Bracliyurus, which also is represented 

 in Gratiolet's figures of Cebus capucinus and C. apella (1. c. pi. x. figs. 7 

 All). This " supraangular " (a .a.) sulcus defines anteriorly the well- 



