NERVOUS SYSTEM. VERTEBRATA. 237 



D. 289. The brain of an Aard-Vark (Orycteropus afer), ( ? ). 



This specimen resembles the preceding in most respects. 

 The suprasylvian sulcus is very insignificant. The lateral 

 sulcus is broken up into two fragments, the anterior 

 (coronal ?) of which does not join the orbital. 



O.C. 1323 L. 



ORDER CARNIVORA. 



Section .ZEiAJROiDEA. 

 Family FELIDJE. 



D. 290. The brain of a Domestic Cat (Felis domestica\ divided by 

 a mesial sagittal section and the right hemisphere separated 

 from its half of the brain-stem. 



The Cats exhibit in perhaps their most pronounced form 

 the peculiarities distinctive of the true Carnivores, of which 

 they form one of the most specialised types. 



In the Carnivora the brain attains to much larger 

 dimensions in proportion to the size of the animal than is 

 the case in the Rodentia, Edentata, and Insectivora, and 

 this increase in size is to be attributed almost entirely to 

 the larger growth of the neopallium. 



Among the secondary expressions of these larger dimen- 

 sions of the neopallium the most noteworthy are: A 

 tendency of the dorso-caudal regions of the hemisphere to 

 bulge over the cerebellum, so that the posterior margin of 

 the hemisphere exhibits an increasing degree of obliquity : 

 the hemisphere also grows forward so as to bulge over the 

 olfactory bulb, and an olfactory sulcus developes on the 

 ventral surface of this neopallium to lodge the bulb and 

 its peduncle: and the arrangement of the sulci becomes 

 more stable and, as it were, fixed. (Compare figs. 116-121, 

 representing the Lion's brain.) 



The brain is still macrosmatic ; but the greater size of 

 the neopallium renders the greatness of the parts of the 

 brain chiefly concerned with olfactory functions less 

 obtrusive than is the case in mammals with a smaller 

 neopallium. 



