NERVOUS SYSTEM. VERTEBRATA. 



317 



expect to find the " Sylvian fissure/' The operculum 

 which forms its anterior (upper) lip meets a slighter 

 posterior operculum, so as to form a pseudosylvian sulcus o 

 the Ungulate type (fig. 1 84, s) . On the left hemisphere there 

 is no other feature which could be called " Sylvian fissure " ; 



Fig. 183. ( X f.) 



SULC.CALC. SULC.INTERCAL. 



Fig. 184. ( X .) 



SULC. SURRAS. 



SULC. ORB. 



but on the right side (fig. 184) there is a very short deep 

 notch (s') above the rhinal fissure, the exact analogue of 

 which is perhaps seen in the brain of the Ox (vide infra), 

 or in the pseudosylvian sulcus of Carnivores. 



0. C. 1328 K. 



D. 413. The brain of an JElian's Wart-Hog (PJiacocTicerus afri- 

 canus) . 



The Sylvian region of this brain exhibits interesting 

 variations of the condition found in the last specimen. On 

 the left hemisphere the sulcus which emerges from the 

 rhinal fissure forms a complex more like the ectosylvian 

 than the pseudosylvian of Carnivores ; and the pit-like 

 depression above the rhinal fissure, noted on the right 



