THE MOUTH. 



429 



Their free part presents, in the virgin tootb, three tubercles : a middle, which is the 

 Btronc-est and two lateral; these, together, are not unlike a trefoil or the upper part of a ^ewr- 

 de-iis" especially those in the upper jaw. On the internal face is remarked a table or slope, 

 somewhat resembling that of the Ox and Sheep, and separated from the root by a very distinct 

 border, the extremities of which mark the lateral lobes. This table is of no advantage in 



*^^ The°root, very developed, flattened oa both sides, and separated from the free portion by 



Fig. 239. 



GENERAL AND LATERAL VIEW OF THE DOG S TEETH. 



a well-defined neck, is solidly encased in a deep alveolus. Its internal cavity is very promptly 

 obliterated. 



When the tooth is submitted to wear, the middle lobe is the first to disappear ; so that it no 

 longer resembles a trefoil (Fig. 240). 



The temporary incisors are much smaller and more pointed than the permanent ones ; yet, 

 like them, they show lateral lobes. At the period of their eruption these teeth are somewhat 

 wide apart. 



The fangs, or canine teeth, two in each jaw, are very strong, elongated organs, conical in 

 form, curved backwards and outwards, and placed immediately after the incisors. 



Fig. 240. 



ANTERIOR VIEW OF THE INCISORS AND CANINE 

 TEETH OF A YEAR-OLD DOG. 



LATERAL AND GENERAL VIEW OF THI 

 cat's TEETH. 



The upper fangs are the thickest, and have a small space between them and the corner 

 incisors, in which the inferior canines are lodged. 



These teeth are deciduous, like the incisors, and are distinguished from the replacing ones 

 by being thinner and more elongated. 

 3D 



