75 



sulci essentially identical with that revealed in the Gorilla's brain. My 

 surprise was due to the fact that the identity of every element was 

 so obvious and certain that there was no room for discussion. 



It is quite unnecessary for me to describe the anatomy of the 

 occipital region in the Apes, seeing that this has been so often and 

 so thoroughly done. The recent memoir of Zuckerkandl i) provides 

 an excellent introduction to these notes. 



The first figure represents the lateral aspect of the occipital region 

 in the left cerebral hemisphere of an Egyptian Fellah (aet. 30 ann.). 

 All the sulci represented here conform to a plan which is practically 

 identical with that of the Gorilla's brain D. 657 in the Museum of 

 the Royal College of Surgeons in London ^). Not only the relative 

 positions but even the shapes of the various sulci of the Ape's brain 

 are exactly reproduced in the human organ. In fact the only note- 

 worthy difference is the failure of the occipital operculum (Fig. 1 

 Operc. occ.) to extend as far forward as the sulcus occipitalis trans- 

 versus in the human l)rain. 



Sulcus 

 temp. sup. 



^ Sulcus intraparietalis 



Sulcus parieto-occipitalis 



Sulcus occ. transv. (Ecker) 



- Sulcus occ. paramesialis 



- - • Ramus dors. s. occ. sup. 

 ■ " Sulcus retrocalcarinus 



- - Sulcus occ. superior 



- Sulcus accessorius (occ. sup.) 



' Sulcus occ. inferior 



Sulc. occ. lunatus 



Fig. 1. The lateral aspect of the occipital region of the left cerebral hemisphere 

 of an Egyptian Fellah ((J, aet. 30 ann.). Semi-diagrammatic (several small furrows 

 have been omitted for the sake of clearness). ^/^ nat. size. 



1) Zur Morphologie des Affengehirris. Zeitschr. f. Morphol. u. 

 Anthropol., Bd. 4, 1902, Heft 3. 



2) See Catalogue, 2. Edit., 1902, Vol. 2, p. 439 sq. 



