602 



MR. F. E. BEDDARD ON THE 



[Dec. 6, 



Dasyprocta azarce. — Total length 46 mm., breadth 30 mm., 

 height 20 mm. 



The cerebral hemispheres are very closely applied along nearly 

 their whole length ; the divergence posteriorly only permits a portion 

 of the anterior pair of corpora quadrigemina to be seen when the 

 brain is viewed from above. Each hemisphere measures 30 mm. in 

 length and is furrowed. The general contour of the hemispheres 

 does not diifer from that of the last animal. 



The principal furrow (fig. 3) runs longitudinally at a distance 



Fig. 3. 



Brain of Dasyprocta azarm. 



A, from above ; B, from the side : d, anterior transversely running furrow ; 

 S, Sylvian fissure ; a, b, c, longitudinal fissures. See p. 607. 



of about 5 mm. from the interhemispheral sulcus. It com- 

 mences close to the posterior margin of the brain and passes 

 nearly as far as the anterior end ; at the end of the first third of 

 the total length of the hemisphere this furrow gives off a branch 

 which runs forwards and outwards, joining the rhinal furrow below ; 

 8 mm. behind this point (on the left half of the brain), or 11 mm. 



