301 



hoof a narrow ring of dark encircling the limb at this point. 

 False hoofs small, and, with the true hoofs, black ; width of the 

 lioof two and a half inches. 



Horns sublyrate, ringed at the lower portion, and spirally 

 twisted, keeled below, and ridged externally. Space between the 

 liorns at their origin two inches ; at the tip six inches ; greatest 

 width, measured from the outside, twelve and three fourths inches ; 

 length of the horn in a straight line sixteen inches ; along the 

 curve outside nineteen inches. Horns black, upper three inches 

 yellow horn-color, smooth, polished, and very pointed. 



The animal equals in size the largest antelopes, and is cer- 

 tainly the handsomest yet discovered ; it is graceful, though 

 somewhat heavy, and is exceedingly shy ; it is also considered 

 by the natives very rare. It is found about the head waters of 

 the Fernand-Vaz, in the immense forests of the interior ; it does 

 not occur on the maritime plains or flat country between the 

 table-land and the sea. In coloration it somewhat resembles the 

 T. euryceros, Gray. 



3. PoTAMOCHCERUs ALBiFKONS, (Du Chaillu,) sp. nov. 



Description of an adult male. Ground color bright red bay. 

 Head white ; a triangular black space, the base between the ears 

 and ending in a point on the median line, about three inches 

 below the eyes. Face elongated, with a black, warty protuberance 

 on each side half-way between the nose and eyes, and in front a 

 circular black line extending nearly to the angle of the mouth ; 

 nose black ; round the eyes long black bristles ; eyes surrounded 

 by a white line three fourths of an inch wide, of the general 

 color of the head interrupted by bay opposite the ears ; from the 

 ears a black stripe mixed with rufous hair coming down the 

 cheeks ; whiskers long, white at the base and reddish at the end, 

 forming a whitish stripe behind the black stripe of the cheeks ; 

 ears elongated, suddenly tapering and ending in a long pencil of 

 hair of whitish color mixed with black ; borders of the ears 

 black. Median line a narrow white stripe, ending at the root of 

 the tail, the lower hair long and mixed with black. Under the 

 jaw whitish, with a few scattered black hairs ; at the angle of the 

 mouth a black band encircling the jaws. Fore-legs in front 

 black mixed with rufous ; behind of the general color of the 



