ANATOMICAL STRUCTURE OF ANTHROPOID APES. 193 



observed, which, however, cannot be classified in a 

 consecutive series. Starting from the brains of 

 lemurs, which do not greatly differ from those of 

 rodents, we can advance by means of very distinct 

 transition forms to the more highly developed cere- 

 bral hemispheres of the large anthropoid apes, the 

 chimpanzee, the gorilla, and orang-utan.* 



Fig. 58. — Brain of gorilla, side view (from Bolau and Pansch). I., Frontal lobs. 

 II., Tissue of Rolando. III., Parietal lobe. IV., Temporal lobe. C. Cerebellum. 

 / s, Fissure of Sylvius, s c. External fissure parieto-occipital. 



Very opposite views prevail among anatomists 

 with regard to the question which species of anthro- 

 poids possesses the most highly developed brain. 

 Some regard the chimpanzee's brain as the simplest, 

 and that of the orang as the most highly de- 

 veloped. In all these apes the lateral halves of 



* The Brain as an Organ of Mind. International Scientific 

 Series. 



