384 A MANUAL OF DENTAL ANATOMY. 



the " blade " only ; it is divided by a V-shaped notch into 

 two lobes, and the posterior tubercle is hardly represented. 



In an extinct feline animal, the Machairodus, found in 

 tertiary strata, and very widely distributed (in France, 

 Italy, India, Brazil, Buenos Ayres) the first of the pre- 

 molars left in the upper jaw of Felis, and there almost 

 rudimentary (see fig. 166), has disappeared; the dental 

 formula is thus : 



? oi 

 3 1 



Hmi 



The upper canines are of immense length, and the ridge 

 of enamel which runs down the front and back surface of 

 the teeth is distinctly serrated ; hence the name of saw- 

 toothed Tiger which has been given to the animal. 



FIG. 167 0). 



The lower canines were quite small, and ranged with the 

 incisors. The enormous length of the upper canine renders 

 it difficult to see in what manner it was made use of, as the 



( 1 ) Side view of the jaws and cranium of Machairodus (Drepanodon) 

 after Owen. 



