LEMUR MONGOZ 33 



extending backward into the Sylvian fossa and exposing a trigonum olfac- 

 toriuni larger than in the higher primates. In the occipital region there is a 

 deep occipital concavity, particularly about the midline, where the superior 



Courusy. Ameruan Museum o/ Natural History 



FIGS. 14 AND 15. H.\ND AND FOOT OF LEMUR POTTO. 



Left. Dorsum of hand showing finger-nails and moderate syndactyle. 

 Right. Dorsum ol loot. Syndactyle not so conspicuous as in Lemur mongoz. 



vermis of the cerebellum is lodged in what may be called the postsplenial 

 fossa. The cerebellum in its tentorial surface presents a prominent superior 

 vermis which appears as a ridge-pole in this sharply gabled surface. Its lateral 

 extension is short because of the limited cerebellar hemisphere. The occipital 

 surface of the cerebellum shows the vermal portion as the most pronounced 

 structure in this area, with two rather insignificant lateral extensions forming 

 the hemispheres (Fig. 18). 



The cerebellum of the lemur shows none of the tendency to form a 

 vallecula into which the vermis gradualK" sinks on account of the increasing 



