266 CLASS MAMMALIA. 



and inside of the limbs ; the ears are not four inches long; 

 and whitish inside ; the general colour of the neck and 

 back is pale dun ; a black streak passes from below the 

 knees, covering the anterior part of the pastern, and a 

 similar spot marks the posterior pastern ; the tail is short, 

 dun at base and black at the end. We have compared two 

 specimens, both males, one from the Cape, the other from 

 Western Africa. 



Although there are marked distinctions between the 

 three above-described species, and there is no direct evi- 

 dence to shew that they arise from difference of age, of 

 which Burcheli's would be the old, and the present the 

 young, yet it was thought preferable to place them under 

 different names, particularly as the Ptoox, is both more 

 daring and agile, and said to have a different voice. 



The Grimm. (A. Grimmia.) This species is now dis- 

 tinctly known by the description of M. F. Cuvier, from 

 the living animal : it is lower than the above, more clumsily 

 built, but equally active and vigorous. The head is rather 

 heavy, terminated by a prominent muzzle ; the horns very 

 short, stout, reclining, and almost concealed by the pro- 

 fusion of black hair covering the forehead, and rising 

 between the horns to a point: this colour descends the 

 whole length of the face ; the ears are short and wide, 

 white on the inside and pale gray on the outside ; below 

 the eye there is a lengthened slit, observed in several of the 

 former, containing an unctuous substance, but no lachry- 

 mary sinus ; the region about the eyes, cheeks, and side of 

 the nose is fulvous-fawn colour, passing in a lower tint 

 down the neck, shoulders, and flanks; the under jaw is 

 white, and the lips and chin dark ash colour ; from the 

 withers to the tail, a broad bluish ash coloured streak 

 covers the back and croup, mixing with the fawn coloured 

 flanks, by an intermediate space of fulvous, which passes 

 also along the buttocks and thighs ; the tail is longer than 



