External Characters of Ruminant Artiodactyla. 217 



A further important and very interesting difference is the 

 presence of a well-developed pouch, lined with short hair, 

 penetrating the internarial septum on each side and openiug 

 by a circular orifice within the anterior angle of the nostril, 

 nearly midway between the latter and the anterior end of 

 entrance to the narial passages. The orifice of this pouch, 



A. Muzzle and rhinarium of Connochcetes gnou from the front. X §* 



(The vibrissae shorter than in nature.) 



B. The same from the side. 



C. The same with the upper lid of the nostril raised to show the orifice 



of the sack penetrating the septum. 

 JD. Extremity of penis of the same from below. 

 E. The same of Gorgon taurinus from the left side. 



like the entrance to the chamber itself, is revealed when 

 the upper lid of the nostril is raised and concealed when it 

 is in its normal depressed position (fig. 2, B, C). 



Owing to the scanty clothing of hair on the dorsal side of 

 the. muzzle, the rhinarium is not so well defined above and 

 behind as in Damaliscus ; it extends less than halfway 



