TN THE LOWER ANIMALS, ETC. 



233 



is the true molar tooth ; its crown consists of a 

 sharp blade divided into two lobes, and is the true 

 sectorial tooth, corresponding with the last upper 

 premolar. 



Tlie teeth are so arranged, that when the jaws 

 are closed, the lower teeth shut within the upper 

 row, and their conical points fit into the tri- 

 angular spaces between the crowns of their 

 antagonists. 



The articulation of the condyles of the lower 

 jaw is so contrived as to set this formidable 

 apparatus in action in the most eflficient manner. 

 These processes are both situated in the same 

 horizontal line; they are cylindrical in form, and 

 are firmly locked in the transversely elongated 

 glenoid cavities, the margins of which are so ex- 

 tended before and behind the condyles, that all 

 lateral motion is impossible. 



t 



I'JG. '62. — Jiiff/U Cot/d^/e, 

 Tiger. 



Fig. ZZ.^ Glenoid Cavity^ right 

 side, 'JHger, 



