264 TEETH OF CARNIVOKA. 



divided into two groups: tlie mono'phyodonis^ or those 

 that generate a single set of teeth; and the di]^liyodonts^ 

 or those that generate two sets of teeth. 



I proceed next to notice the principal modifications of 

 the teeth, as they are adapted to carnivorous, herbivorous, 

 or mixed feeding habits in the diphyodont mammalia. 



The lion may be taken as the type of the flesh-feeders 

 (Fig. 69). 



The largest and most conspicuous teeth in this and 

 other feline quadrupeds are the " canines," c ; they are of 

 great strength, deeply implanted in the jaw, with the fang 

 thicker and longer than the enamelled crown: this part 

 is conical, slightly recurved, sharp-pointed, convex in 

 front, almost flat on the inner side, and with a sharp 

 edge behind. The lower canines pass in front of the 

 upper ones when the mouth is closed. 



The incisors, six in number on both jaws, form a trans- 

 verse row ; the outermost above, ^, is the largest, resem- 

 bling a small canine: the intermediate ones have broad 

 and thick crowns indented by a transverse cleft. 



The first upper premolar, ^j 2, is rudimental : there is 

 no answerable tooth in the lower jaw. The second, p 3, 

 in both jaws has a strong conical crown supported on two 

 fangs. The third upper tooth, j9 4, has a cutting or 

 trenchant crown, divided into three lobes, the last being 

 the largest, and with a flat inner side, against which the 

 cutting tooth, ml, in the lower jaw works, like a scissor- 

 blade. Behind, and on the inner side of the upper tooth, 

 ]} 4, there is a small tubercular tooth, in\. A glance at 

 the long and strong, sub-compressed, trenchant, and 

 sharp-pointed canines, safiices to appreciate their pecu- 



• fxQ'^oci^ once ; <}jua;, I genei 

 ^ Stf, twice ; <^\)m and oJot;?. 



