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N. W. INGALLS 



Schuster gives a similar distribution for his inferior parietal type 

 in the baboon, Papio hamadryas (Cynocephalus hamadryas). 

 It may be also mentioned at this time that the more constant re- 

 lation between areas and fissiires is to be found in the work of 

 Mauss. 



As indicated earlier in this paper, we are more especially con- 

 cerned with the area praeparietalis, type 5, the area parietalis, 

 type 7 and their associated furrows, and the area praeoccipitalis, 



Fig. 13 Cortical areas in Cercopithecus, after Brodmann ('08), figure 90. 



peristriata, type 19. For our purpose it is unfortunate that the 

 Gibbon brain figured by Mauss does not exhibit a more typical 

 arrangement of gyri and sulci. A comparison of Hylobates and 

 Cercopithecus (figs. 12-14) will make it plain that the greatest 

 change has taken place in the area parietalis, type 7. Present 

 to a small extent above the interparietal (Brodmann) in Cercopith- 

 ecus, it forms a very extensive area above that fissure in Hylo- 

 bates. The preparietal area, 5, has taken up what seems to be 

 a new position, being drawn out as a long narrow zone between 

 the area parietalis and the area postcentralis caudalis, type 2, 



