THE TEETH 



409 



lateral to this tooth. The broad fang curves upward, outward, and 

 backward. 



The upper canine (Fig. 324) is a strong, pointed, and curved tooth. 

 The single subconical fang is longer than the crown ; the cingulum is 

 not well marked. The crown presents a small inner surface, which is 

 slightly concave from above downward and convex from before back- 

 ward ; a larger outer surface, which is convex in both directions, but 

 more strongly from before backward ; a gently arcuate and rounded 

 anterior border, and a sharper emarginate posterior border. The outer 

 surface is usually marked by vertical grooves, along one of which the 

 tooth often breaks when drying. 



FIG. 325. 



Posterior Border. -/^,iTJto- Anterior Border -S^g Posterior Border. 



-Neck. 



\ I 

 Fang \ j|f Fang. \ 



Anterior Border. 



Outer Side. 



INNER ASPECT. OUTER ASPECT. ANTERIOR ASPECT. 



RIGHT FIRST UPPER PREMOLAR TOOTH. 



The first upper premolar (Fig. 325) has a single fang, supporting 

 a small laterally compressed conical crown ; it may have two fangs, in 

 which case the crown has greater antero-posterior length and may 

 have a small posterior cusp. 



The point of the single cusp is anterior to the middle of the crown. 

 The shorter rounded anterior border is directed toward the inner side 

 of the anterior end of the base ; the longer posterior border is sharper, 



FIG. 326. 



Posterior 

 Basal Cusp. 



Talon. 



Posterior 

 Fang. 



Anterior Border. 



Cingulum. 



Anterior Fang.- 



Anterior Border. 



Cingulum 



Anterior Fang. 



Based Cusp. 



Talon. 



Groove. 



Posterior 

 Fang. 



INNER ASPECT. ANTERIOR ASPECT. OUTER ASPECT. 



RIGHT SECOND UPPER PREMOLAR TOOTH. 



and, near the cingulum, separates two depressions, whereof the inner 

 is the deeper. The outer surface is more strongly convex from above 

 downward than is the inner surface. 



