142 THE GENERAL ANATOMY OF THE CERCOPITHECIDAE [SECT. A 



Hapale (Fig. 87), the Lemur (Fig. 46) and Tarsius (Fig. 64) are to 

 be compared. 



The mid-brain has undergone little or no evolutionary change. 

 The cerebellum is enlarged as compared with its condition in the 

 Lemurs. Its form is modified by the contact of the occipital lobes. 



Fig. 87. Hapale jacchus, a small American monkey (Mannozet). Cortical 

 areas of the brain. Lateral convexity. For comparison with Figs. 46, 64, and 85. 

 (From Brodmann, op. vit.) 



Fig. 88. Hapale jacchus. Cortical areas of the brain. Mesial aspect of the 

 hemisphere. For comparison with Figs. 47 and 86. (From Brodmann, op. cit.) 



The floccular lobe is still divisible into a flocculus an< I a paraflocculus. 

 Both are reduced in size, but the paraflocculus retains a petrosal 

 lobule which the Cercopithecidae possess in common with some 

 more lowly mammals. The pons varolii is large, but the trapezium 

 is still exposed on the surface along its hinder margin. 



