THE ANTELOPES AND OXEN. 



183 



respect to the above-mentioned animals. The 

 Cainotheria, to judge from the quantities of their 

 remains, must have lived in herds after the 

 manner of the Antelopes ; hence hundreds of skulls 

 and thousands of lower jaws could be compared. 

 Further, an extraordinary variability was found 



FIG. 30. Skull of Cainotherium metopias. Nat. size (after 

 Fiihol). 



in the canine tooth (Fig. 30, c), and in the front 

 premolars. The normal row of teeth, i.e. the teeth 

 inherited from early times, begins to show gaps; 

 a small gap occurs between the canine and the 

 first premolar ; the latter then moves towards the 

 canine ; frequently the second premolar follows ; 

 both thus obviously become useless, and the next 



