322 N. W. INGALLS 



fit certain sections, of which there are rather too few, satisfactorily 

 into their chart is quite hopeless, and when one is dealing With 

 other individual brains for the sake of comparison the difficulty 

 is still more pronounced. 



As an example of one of these disconcerting discrepancies, it 

 may be mentioned that Mauss ('11) in his text (p. 444) states 

 that area 7 is bounded in front by areas 2 and 5 and behind by 

 areas 19 and 22 and indeed this is quite obvious from his chart 

 of the Gibbon (fig. 24), but the section represented in figure 13 

 shows areas 5 and 19 in direct relation with each other in two 

 places, apparently a considerable extent of contact. The same 

 confusion exists in the description of the brain of the Orang 

 (q.v.) where chart and sections are, in certain respects, quite ir- 

 reconcilable. To what extent this strip of cortex, deeply buried 

 in the interparietal (a part of area 5 according to the sections oi 

 Mauss), may be looked upon as a part of the primitive area? — 

 instead of 5— and in how far a comparison might be instituted 

 beween it and the similarly placed " visuo-sensory band" of 

 Elliot Smith (I.e. '07, p. 245), which unites the general sensory 

 and visual cortex, we shall leave for the present an open question. 



In Cercopithecus the preoccipital, a peristriate area, makes 

 up the larger part of the first annectant gyrus, a varying extent 

 of the posterior limb being composed of occipital or parastriate 

 cortex,while a smaller part of the anterior limb, extending from 

 the superior parietal lobule to about the point where, as noted 

 earlier, the interparietal is continued upward limiting the first 

 annectant gyrus in front, is occupied by the parietal area (pre- 

 parietal, Mauss). The preoccipital area extends laterally along 

 both sides of the descending limb of the interparietal, the anterior 

 wall of the sulcus lunatus and the second temporal gyrus. The 

 arrangement of areas 2, 5 and 7 can be seen from the accompany- 

 ing the diagrams, the anterior wall of the inferior postcentral (in- 

 terparietal) being formed low down, near the surface by area 2, 

 and more deeply by 5, the latter being more deeply situated than 

 would appear from the charts. As regards areas 18, 19 amd 22 

 there is some difference in the descriptions of Brodmann and 

 Mauss. According to the former, 18 occupies both walls of the 



