NERVOUS SYSTEM. VERTEBRATA. 381 



Suborder ANTHROPOIDEA. 

 Family 



D. 549. The brain of a Pinche Monkey or Tamarin (Midas 

 cedipus), (rf), (fig. 222). 



With this specimen we enter on the account of the brain 

 in that higher division of the Primates known as the Sub- 

 order Anthropoidea *. Although the brain may lx> smaller 

 than that of many Lemurs, its proportions are different, 

 inasmuch as the occipital parts of the cerebral hemispheres 

 overlap the cerebellum to a distinctly greater extent than 

 is the case in the brains of the Lemuroidea. This character 

 reaches its greatest degree in a member of the Family 

 Cebidse, viz., in Clirysothrix, in which it is developed to an 

 extent unsurpassed even in Man. 



Fig. 222. (Nat. size.) 



CALCAR 



This small brain is characterized by a remarkable poverty 

 of sulci, even when allowance is made for the absolutely 

 small dimensions of the cerebral hemisphere, as will be 

 better understood when this brain is compared with those 

 of Nycticebus tardigradus and Loris gracilis, which it 

 resembles in size. The Sylvian fissure commences below 

 in a Sylvian vallecula which is so fissure-like that the dis- 

 tinction between vallecula and fissure would be unjustifiable, 

 but for the fact that the limits of the two are marked by 

 the postsylvian part of the rhinal fissure. The latter is 



* The separation of the Lemuroidea from the other Primates as a separate 

 suborder is certainly not justified by the evidence of cerebral anatomy, as 

 there is a very close affinity between the brain-type of the Lemurs and the 

 Cebidse. 



