JAWS AND TEETH OF HEKBIVORA. 147 



the masseter arises, takes a wide span outwards, 

 so as to give great strength to the muscle. The 

 condyle, or articulating surface of the jaw (c), is 

 received into a deep cavity, constituting a strictly 

 hinge joint, and admitting simply the motions of 

 opening and shutting. 



In herbivorous animals, on the contrary, as 

 may be seen in the skull of the Antelope, Fig. 

 275, the greatest force is bestowed, not so much 



on the motions of opening and shutting, as on 

 those which are necessary for grinding, and 

 which act in a lateral direction. The temporal 

 muscles, (occupying the space t,) are compara- 

 tively small and feeble ; the condyles of the jaw 

 are broad and rounded, and more loosely con- 

 nected with the skull by ligaments ; the muscles 

 in the interior of the jaw, which move it from 

 side to side, are very strong and thick ; and the 

 bone itself is extended downwards, so as to afford 

 them a broad basis of attachment. The surfaces 



