348 STEUCTUEE AND ADAPTATION OF TEETH 



The masseter and temporal muscles are of 

 moderate size, the parietal bone exhibits no de- 



rm. %{).— Human Skull. 



pression for the attachment of the temporal 

 muscle, and the bony intermuscular crests en- 

 tirely disappear. The temporal fossa, the zygoma, 

 and the coronoid process of the lower jaw are 

 smaller : the vertical ramus of the lower jaw is 

 larger, and forms a more acute angle with the 

 base. The condyle is more elevated and convex, 

 and the glenoid cavity is deeper than in the Qua- 

 drumana. The intermaxillary bones have a sepa- 

 rate existence in the foetal condition only. 



We have observed that even in those animals 

 which approach most nearly to the human form, 

 the bones of the face are larger than the cranium. 

 In striking contrast to these, the conditions are 

 reversed in man ; the skull is larger, its external 

 surface smooth, and its cavity very capacious. 

 The organs of the senses occupy a much dimi- 



