80 



found in a specimen of Hylobates Miilleri) sliows that this form of 

 "Affenspalte" is really ancestral. In Fig. 4 the paramesial sulcus is 

 small and is separated from the lunate sulcus by an unusually ex- 

 tensive backward prolongation of the mesial branch of the sulcus 

 occ. transversus. 



S. par. occ. 



S. occ. parames. 



S. rotrocalc. - 



- "V S, intrapar. 



■ S. occ. sup. 

 S. access. 



S. occ. inf. 



Fig. 2. Tlie dorso-caudal aspect of the occipital region of the right cerebral 

 hemisphere of an Egyptian. Ad naturam del. 



S. par. occ. 



S. occ. parames. 



- S. temp. sup. 



S. occ. inf. 



S. occ. lunat. 



S. intrapar. - 



S. par. occ. 



S. occ. trans. '~ 



S. occ. 

 parames 



^ \ 



S. occ. sup. 



S. occ. lunat. 



Fig. 3. 



S. occ. sup. 

 Fig. 4. 



Fig. 3. The dorsal aspect of the right occipital region in Hylobates Miilleri. 

 Fig. 4. The corresponding region in an Egyptian brain. % ^^^^ gj^g. 



