THE TEETH 



433 



FIG. 360. 



ceding second premolar. The internal anterior cusp (deuterocone) 



(Fig. 361) was far in advance of the rest of the tooth, and connected 



with the border of the principal cusp. The 



cutting blade consisted of a single protocone 



with convex sloping outer surface, and a 



small posterior cusp which turned outward 



behind to form a small talon. The fangs 



were fused into a small conical mass. In 



this specimen the molar was well developed, 



with two large fangs. 



The other abnormal sectorial tooth (Figs. 

 356, 362) is on the left side of the specimen 

 with the abnormal second premolar teeth. 



Here the protostyle is large and overlaps the talon of the preceding 

 tooth ; the deuterocone is reduced to a cingular tubercle which is not 

 carried on a separate fang. The anterior border of the cutting blade 



ABNORMAL LEFT UPPER SEC- 

 TORIAL TOOTH. 



Posterior Basal Cusp 

 Talon., 



Posterior Fang 



FIG. 361. 



Principal Cusp. 

 Anterior Sasal Cusp. ., 



Anterior Fang. 



Posterior Basal Cusp. 

 Talon. 



Posterior Fang. 



OUTER ASPECT. INNER ASPECT. 



ABNORMAL LEFT UPPER SECTORIAL TOOTH. 



is almost horizontal, and notched to form a second small intermediate 

 cusp. The outer side of the blade shows signs of caries. 



Not infrequently the sectorial, while in other respects normal, 

 presents on the anterior border of the cutting blade a very small 

 additional cusplet (Fig. 327). 



The Upper Molar I ). Size. The molar is very variable in 



size and in the distinctness of the markings on its crown. Out of one 

 hundred specimens, in twenty-one it had a single fang ; in thirty, two 

 fangs ; and in forty-four the two fangs were more or less coalesced. 



Number. No cases of supernumerary upper molars have been 

 reported. It was absent in four maxillaries out of the one hundred 



I examined. Hensel notes one case only. 



28 



