146 COMPARATIVE DENTAL ANATOMY 



ization. The Cave-lion and Cave-bear and tiger 

 were large and fierce, with a massive dentition 

 which armed them well for preying on the great 

 pachyderms of that period. The canines were 

 immense, and in some curious forms, as the Smilo- 

 don, reached far below the jaw even when the 

 mouth was opened wide. The great saber-toothed 

 cat (Machcerodus) had great trenchant canines 

 with denticulated edges, which caused the devel- 



FiG. 55. — Teeth of Wolf (Cam's lupus). 



opment of a wide flange beneath the lower jaw 

 where the canine passed, like a sheath for its pro- 

 tection. 



The CanidcE includes the Dogs, Wolves, Jackals, 

 Foxes, etc. The formula usually is, — 



. 3-3 1-1 4-4 2-2 ACi 



l. — c. p.m. m. -— - = 40. 



3-3 1-1 F 4-4 2-2 



The teeth are reduced from the extreme carniv- 

 orous type of the cats, as the diet is mixed and 

 the teeth respond to the changed conditions of 



