NERVOUS SYSTEM. VERTEBRATA. 



10'J 



D. 593. The brain of a Long-haired Spider- Monkey (Ateles vel- 

 lerosus) : young male. 



The right hemisphere has been dissected from above to 

 display the structures in the descending and posterior cornuu 

 of the lateral ventricle. The hippocampus major and the 

 fimbriated extremity of the fornix accompanying it are well 

 shown ; the optic thalamus and corpus striatum are also 

 visible ; the great length of the posterior cornn of the 

 lateral ventricle and the prominence in its wall corresponding 

 to the calcarine sulcus, are very noteworthy features of the 

 dissection. 0. C. 1337 H. 



Family CERCOPITHECID^. 



D. 594. The brain of a Bonnet Macaque (Macacns sinicus) : the 

 left hemisphere has been detached. 



Fig. 241. (xi) 



a SULC INTERCAL. 



SULC. ROSt 



SULC.P.CALC-C" 



SULC. INF. OCC. 



SULC. COLL 



HIP. F. ""' PYR.L. 



RHIN.F. "SULC.COLL 



The " gyrus lunaris " of Retzius is the nucleus amygdalae 

 SULC. P. CALC. refers to the retrocalcariiie sulcus. 



With the present specimen we enter upon the consider- 

 ation of the brain among the Catarrhine Apes (Old World 

 Monkeys). 



There is a close resemblance between the brain in the 

 larger Cebidje and that of the Cercopithecidse. The general 

 form of the brain is the same in the two Families. 



In spite of this identity of structure with the Cebida>, it 



