External Characters of Ruminant Artiodactyla, 453 



But the success of such .ati undertaking wouhl be doubtful, 

 seeing that the skulls of some dotncsticated l)i'ee(ls ditter 

 more from auroclis-like breeds than the hitter differ from 

 other genera of Boviuie. To this variability is probably to 



Fig. 3. 







fe'' 



Will' 



A. 



a. 

 c. 



Rhiniirium of yak {Foephayus fjrunniens) from the front. X ^. 



Tlie same from the side. 



The same of zebu {Bos indicus). X 5. 



be attributed in a great measure the prevalent admission of 

 subgeneric rank to the groups into which the existing species 

 of Boviuje fall. The ears are no less variable in size and 

 shape than the skull and horns, even in closely related 

 breeds. 



