IN THE LOWER ANIMALS, ETC. 241 



tive size of the cranial cavity, and the propor- 

 tionally greater length of the bones forming the 

 face. The orbits, instead of the forward direction, 

 are widely separated, occupying the sides of the 

 head, and are entirely surrounded by a bony ring, 

 its continuity being completed by the extension 

 of the malar process to the zygomatic arch; which 

 presents a striking contrast, in its smaller size, 

 to the corresponding widely-arched bone in the 

 carnivora. (See Fig. 34.) 



The long, slender, intermaxillary bones, are 

 destitute of teeth ; but, in place of incisors, the 

 upper jaw is provided with a callous rim, which 

 meets the lower incisors. 



The cuspidati are absent in the upper jaw, and 

 the lower cuspidati so nearly resemble incisors, 

 that they have sometimes been described as such ; 

 but the alveolar processes are very deep and fully 

 developed for the reception of the long molar 

 teeth ; of which class there are three premolars, 

 and three true molars on each side of both jaws. 



Fig. 40. — Skull of iiheeit, shuwi/iy absence of incisors and cuspidati in 

 upper Jaw. 



B 



