304 



THE TEETH. 



Fis. 20? 



]^1accd. Tho rroivn is compressed antero-posteriorly, and is convex, 

 not only on its outer or Jabial surface, like the preceding teeth, 

 but on its inner surface also, which rises 

 vertically from the gum : it is broader than 

 that of an incisor or canine tooth, and 

 is surmounted by tivo pointed tubercles or 

 cusps, of which the external one is larger 

 and higher than the other. The fang is 

 similarly compressed, and is deeply grooved 

 in all cases, showing a tendency to become 

 double. The apex of the fang is generally 

 bifid, and in the second upper bicu.-pid the 

 root is often cleft for a considerable 

 distance ; but the bicuspid teeth are very 

 variable in this respect, and may be, all 

 four, free from any trace of bifidity of the 

 root. The upper bicuspids are larger than 

 the lower ones, and their cusps are more 

 deeply divided. Sometimes tlie first lower 

 bicuspid has only one tubercle distinctly 

 marked, i.e., the external, and in that case 

 approaches in figure to a canine tooth. 

 The onolm- teeth (fig. 205), true or large molars, or grinders, are 

 twelve in number, and are arranged behind the bicuspid teeth, three on 



Fig. 200. — CANI^•E Tuoth of 

 THE Upper Jaw. 

 a, front view ; h, lateral 

 view, showing the long fang 

 grooved on the side. 



Fig. 204, 



Fig. 205, 



Fig. 204. — FinsT Bicuspid Tooth of the Upper and Loijer Jaws. 



a, front view ; h, lateral view, showing the lateral groove of the fang, and the 

 tendency in the upper to division. 



Fig. 205. — First Molar Tooth op the Upper and Lower Jaws. 

 They are viewed from the outer aspect. 



each side, above and below. They arc distinguished by the large size 

 of the crown, and by the great width of its grinding surface. The first. 



