436 



ZOOLOGY 



(a) The large brain, the cerebrum very large and 

 much convoluted ; that is to say, the apparatus 



After Iluxlcy 

 FIG. 201. Man and the higher apes : a, orang; b, chimpanzee; c, gorilla; d, man. 



for receiving and storing impressions is very 

 greatly developed. 



(b) The face is shortened, so that the profile, at least 



in the higher types, is practically vertical. 



(c) The lower jaw presents a distinct angle, the chin, 



at least in the best-developed races and individ- 

 uals. 



(d) The premaxilla, or anterior portion of the upper 



jaw, is not a separate bone, except at an early 

 age. 



(e) There is no distinct space (diastemma) between 



the incisor and canine teeth. 



(/) The canine teeth are not appreciably larger than 

 those next to them ; that is, there are no dis- 

 tinct tusks. 



(g) The spinal column has four curves, an adaptation 

 to upright posture. 



(h) The arms are not so long as the legs. 



(i) A small bone, the os centrale, has disappeared 

 from the carpus or wrist. 



