External Characters of Ruminant Artiodactyla. 451 



The penis of B. taurus, as figured by Garrod (Proc. Zool. 

 Soc. 1877, p. 10, fig. 19) is well known. It ends in an 

 ovately rounded knob or cushion, on the lower side of which 

 the orifice of the urethra terminates without running out 

 into a definite tubular prolongation. In B. indicus (fig. 4, 

 B, C) the penis is of a similar type. 



Fig. 1. 



A. Rhinarium of zebu (Bos indicus) from above. 



B. The same from the front. 



The only existing members of this genus, as here recorded, 

 are the numerous domesticated breeds of cattle referred to 

 B. taurus and B. indicus. Apart from these there are a 

 certain number of extinct species, of which the aurochs 



33* 



