NOTICES OF NEW BOOKS. 33 



however, be almost straight, as in the Gemsbok (Oryx) ; curved 

 backwards and marked by bold rings as in the Sable Antelope 



Fig. 2. — Head of Water-buck, Cobus ellipsiprymnus. 



(Hippotragus) ; ridged and spirally twisted, either on its own 

 axis, as in the Eland (Oreas), or in a corkscrew shape, as in the 

 Kudu (Strepsiceros), or sharply bent down and then upturned, as 

 in the Gnu (Conochetes). In the Hartebeests (Bubalis), we have 

 a different form again. In this genus the horns are characterised 

 by a remarkable divergence at the base, so much so that in one 



ZOOLOGIST, THIRD SERIES, VOL. XVIII. JAN. 1894. D 



