434 



MAMMALIAN ANATOMY 



First Lower Premolar (- -). Size. The variations in size 



\pm I/ 



are not especially noteworthy. It appears always to have two fangs. 

 It is interesting to observe that in two other species of cats Bateson 



FIG. 302. 



^Principal Cusp. 



Posterior Basal 

 Cusp. 



Posterior Fang 



Anterior Basal 

 Cusp. 



Anterior Fano. 



OUTER ASPECT. 



Principal Cusp, 



Anterior Basal 

 Cusp. 



Inner Cusp. 



Anterior Fang. 



Posterior Basal 



??1 Posterior Fang. 



INNER ASPECT. 

 ABNORMAL LEFT UPPER SECTORIAL TOOTH. 



FIG. 363. 



found the lower premolar abnormal. In a skull of F. tiyris " the 

 anterior right lower premolar has a thin supernumerary root on the 

 internal side of the tooth at the level between the two normal roots." 



In a skull of F. fontanieri the right lower 

 premolar " has an additional talon on the 

 internal and anterior surface." 



Number. I have never noted the 

 absence of this tooth or a case of a super- 

 numerary lower premolar. Hensel records 

 an additional tooth in front of the premolar 

 and behind the canine in four cases out of 

 two hundred and fifty-two skulls, once on 

 both sides of the lower jaw, the abnormal 

 tooth being as large as the normal, once 

 on the right side, and once on the left. 



ABNORMAL POSITION OF SECOND 

 LOWER PREMOLAR. 



