NERVOUS SYSTEM. - VERTEBRATA. 257 



D. 312. The brain of the Suricate (Suricata tetradactyla) , ( c? ) 



In most respects this brain closely resembles that of 

 Herpestes. 



The " Sylvian fissure " is a mere notch in the upper lip 

 of the rhinal fissure, surrounded by an arcuate ectosylvian 

 sulcus : there is a large crucial sulcus and a small orbital 

 (presylvian) sulcus, which, under normal conditions, would 

 be completely hidden by the olfactory bulb. 0. C. 1325 G. 

 Mivart, Journ. Linn. Soc., vol. xix. 1886, p. 8. 



Presented by J. Lemage, Esq. 



D. 313. The brain of Nandinia binotata. 



This resembles the brain of the Genet in most of its 

 features. The Sylvian region, however, resembles that of the 

 Civet's brain, more especially as seen in specimen D. 302. 



0. 0.1325 a a. 

 Mivart, Journ. Linn. Soc., vol. xix. 1886, p. 6. 



D. 314. The brain of Nandinia binotata. 



Note the absence of the crucial sulcus and the insig- 

 nificant proportions of the mere notch which represents 

 the " Sylvian fissure/' 0. C. 1325 G b. 



Family HYJENIDJE. 



D. 315. The brain of a Hyaena (Hyana hycena), ($}. 



The so-called " Sylvian fissure " (fig. 130) presents a 

 marked contrast to the similarly-named feature of the 



Fig. 130. (x.) 



SULC..ECTOS.K 



Cat's brain ; in the latter it is short and relatively shallow, 

 whereas it is very long and deep in the Hyaena. At a 

 VOL. n. s 



