NERVOUS SYSTEM. VERTEBRATA. 267 



there is a definite postlateral sulcus and none in the other 



two. In one brain the coronal and ansate sulci are replaced 



by irregular tri radiate and H-shaped sulci. whereas in the 



others we find the typical combination of ansate, coronal, 



and lateral sulci. 0. C. 1325 R a. 



Presented by St. George Mivart, Esq. 



St. George Mivart, Journ. Linn. Soc., vol. xix. 1886, 



p. 10. 



D. 338. The brain of a Crab- eating Raccoon (Procyon cancri- 

 vorus), (c?). 



This closely resembles the Raccoon's brain. 



On the right hemisphere there is a short postlateral 

 sulcus, which extends forward between the lateral and the 

 postsylvian sulci so as to simulate the ectolateral sulcus. 



The latter, so characteristic of the Cynoidea, is absent in 

 the Arctoidea, as it is also in the ^Eluroidea. 0. C. 1325 R b. 



Mivart, Journ. Linn. Soc., vol. xix. 1886, p. 11. 



D. 339. The brain of a Coati (Nasua nasua). 



This brain closely resembles that of the Raccoon. 



There is no trace of the precrucial sulcus. The coronal 

 and lateral sulci, and a moderately extensive postlateral 

 sulcus are joined to form a great arc. The ansate is repre- 

 sented by several small postcrucial sulci. 



There is a shallow entolateral sulcus, joined to the lateral in 

 a different manner on the two hemispheres. 0. G. 1325 Q b. 



St. G. Mivart, Journ. Linn. Soc., vol. xix. 1886, p. 11. 



D. 340. The brain of a Coati (Nasua nasua) . 



A small precrucial sulcus can be seen near the mesial 

 edge. 



The coronal, lateral, and postlateral sulci are each in- 

 dependent of the others on the left side, but on the right 

 side the lateral and postlateral are joined. 0. C. 1325 Q c. 

 Presented by St. George Mivart, Esq. 



D. 341. The brain of a Mexican Coati (Nasua narica), ( $ ). 



This brain resembles that of the common Coati. There 

 is a very small u Ursine lozenge." 0. C. 1325 Q a. 



