Gorilla 



Pithecanthropus 



lonio sapi> I 



FIGS. 372 TO 3-4. A COMPARISON OF THE ENDOCRAXIAL CASTS OF GOKll I A, 

 PITIIECANTHKOPL S WD HOMO SAPIENS. THE PRINCIPAL FA OLl TION ARV 

 EXPANSION APPEARS IN HIE FRONTAL LOBE. 



I8-3] 



