A Study of Cerebral Anthropology 55 



Mesial and Inferior Surface 



The sulci orhitales are extremely simple in their arrangement. 

 Sulcus cinguli is represented by one continuous sulcus which has 

 several deep lateral branches. At the anterior end the frontal sur- 

 face is quite complex in its arrangement, for there are present 

 sulcus rostralis, subrostralis, transversus, and accessory anterior 

 ramus, in addition to the ramus anterior sulcus cinguli. 



The sulci of the praecuneus are very simple : the sulcus prae- 

 cunei is represented by a single fissure. The sulcus subparietalis 

 is arranged in the form of an " H " and is v^ithout outside con- 

 nections. The fissura parieto-occipitalis is one of the deepest 

 fissures of the hemisphere, and communicates directly with the 

 fissura calcarina, that is, there is no evidence of an earlier gyrus 

 cuneo-lingualis ; it is not possible to make out an incisura parieto- 

 occipitalis and there is clear evidence of the constituent sulci of 

 the fossa. 



The fissura calcarina is represented by a continuous fissure 

 which can readily be seen to be made up of the sulcus retrocal- 

 carinus, which does not terminate in a bifurcation just beyond the 

 occipital pole, and the sulcus calcarinus, which terminates nor- 

 mally seven millimeters from the fissura hippocampi. The sulcus 

 limitans arae striatae inferior and superior are both well de- 

 veloped, the former is confluent with the subcalcarine sulci 

 (Sergi), and through them with the fissura collateralis. The 

 fissura collateralis forms a continuous and simple fissure and is 

 separated a short distance from the sulcus rhinencephali inferior. 

 The gyrus fusiformis is extensive and irregular in outline. It is 

 limited laterally by two short irregularly placed segments, the 

 representatives of the sulcus temporalis inferior. The insula 

 presents no points out of normal, it shows on its surface three 

 sulci breves, a sulcus centralis and sulcus longitudinalis. 



Right Hemisphere. Lateral Surface 

 Fissura Sylvii: This fissure presents much the same appear- 

 ance as the opposite side; it is slightly shorter and the rami 

 ascendens anterior and horizontalis are nearer together. The 



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