930 



MR. F. E. BEDDARD ON THE ANATOMY 



[Dec. 14, 



they do not meet. They more nearly meet, however, on the right 

 side than on the left. 



The furrows on the mesial aspect of the hemispheres differ in 

 some small details from the corresponding furrows figured by 

 Flower and Elliot Smith in the brain of the species Pithecia 

 'Dionachus. 



Text-fie-. 286. 



Brain oi Pithecia pithecia. 



The upper figure represents the dorsal aspect, the lower figure the right-hand 

 lateral aspect. 



s.c. Sulcus centralis, s.l. Sulcus lateralis, s.j?. Postsylvian fissure, s.p.o. Sulcus 

 parieto-occipitalis. s.r. Sulcus rectus, sj/. S.ylvian sulcus. 



The mesial par ieto- occipital fissure differs rather on tlie two 

 hemispheres ; it is much deeper as well as longer on the left side 

 than on the right. The furrow is nearly vertical to the longi- 

 tudinal axis of the hemisphere, and at the lower end inclines 

 slightly forward on the left hemisphere and slightly backwards 

 on the right. It was not double as it is indicated to be in 

 Pithecia monachus by Elliot Smith. 



The calcarine fissure also difiers on the two sides of the brain. 

 In that of the right hemisphere the anterior limb of the Y is very 



