210 MAMMALIAN DENTITION 



where there is much less attrition, the style is seen emerging 

 beyond the bony palate and the tooth is not yet worn to the 

 level of its apex. In the third molar which has only just 

 erupted the style is still imbedded in the maxilla. 



The origin and divergences of this extensive order are 



F'g. 76. — Dentition of domestic Cow (Bos taurus, 9.7354-9). Note the small lower 

 deciduous canine (lost on the right side), the third deciduous molars (removed on one 

 side to show the erupting premolar beneath) and the second upper left deciduous 

 molar. 



interesting though largely obscure. We have already noted 

 that the Camels and Llamas separated from the main stock at 

 least as far back as the middle Eocene. SomeAvhat later, in the 

 middle Oligocene, the Cervicornia and Cavicornia diverged 

 from each other. From the former the Giraffe originated and 

 became very widely distributed in the Miocene. In this epoch 



