External Characters of Ruminant Artiodactyl a. 453 



But the success of such an undertaking would be doubtful, 

 seeing that the skulls of some d da differ 



more from aurochs-like breeds than the latter differ from 

 other genera of Bovinae. To this variability is probably to 



Fig. 3. 



lip 



A. Rhinarium of yak (Poephagus grunniens) from the front. 

 B 



C. Tho same of zebu {L'os iiidicits). X g. 



X h 



be attributed in a great measure the prevalent admission of 

 subgeneric rank to the groups into which the existing species 

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

 shape than the skull and horns, even in closely related, 

 breeds. 



