1 88 STRUCTURAL AND SYSTEMATIC ZOOLOGY 



5. Carnivora, or beasts of prey, may be recognized by 

 their four long, curved, acute, canine teeth, the gap be- 

 tween the incisors 

 and canines in the 

 upper jaw for the 

 reception of the 

 lower canine, and 

 molars graduating 

 from a tuberculate 

 to a trenchant form, 

 in proportion as 

 the diet deviates 

 from a miscella- 

 neous kind to one 

 strictly of flesh 

 (Figs. 303, 307). 

 The incisors, ex- 

 cept in the pinni- 

 grades, number six 

 in each jaw. There 

 are always two 

 sets. The skull is 

 comparatively 



FIG. 176. Wolf (Lupus occidentalis}. United States. 

 Copyright, 1901, by N.Y. Zoological Society. 



FIG. 175. Raccoon (Procyon lotor). United States. 



the jaWS are 



shorter and deeper 

 than in ungulates, 

 and there are nu- 

 merous bony ridges 

 on the inside and 

 outside of the cra- 

 nium the high 



FIG. 177. Ermine weasel (Putorius noveboracensis) . QCCiDital CTCSt be- 

 United States. 



ing specially char- 

 acteristic. The cerebral hemispheres are joined by 

 a large corpus callosum, but the cerebellum is never 



