192 



ANTHROPOID APES. 



parts, as well as of the posterior callosities in the 

 chimpanzee, and also in the baboon and macaca, 

 during the period of sexual excitement. 



Nervous system. — In this part of the organism we 

 are especially interested in the structure of the 



Fig. 57. — Brain of the chimpanzee, seen from above. The upper part of the 

 right hemisphere is removed so as to lay l)are the lateral ventricle (Vogt, from 

 Marshall). L. Longitudinal fissure (other indications tlie same as in Fig. 56). 

 c s. The corpus striatum in anterior cornu of the ventricle, c a, Hipppo- 

 campus major in descending cornu. h m. Hippocampus minor in posterior 

 cornu. 



brain. Bastian justly remarks, with reference 

 to the brain of apes, that this family possesses 

 many cerebral characteristics in common, by which 

 their close connection with each other may be 

 verified. DLstinct stages of development have been 



