Height at shoulder from 39 to 45 inches. Body above sandy brown, hairs beneath whitish; flanks rather browner, in contrast to the conspicuous white rump. Upper part of the ears outside and their rims blackish, inside filled with long white hairs. Hairs of neck long and thin, rather paler in colour than the back. Front of face brown like the back, but rather darker; eye-stripe, line round the naked black muzzle, and chin white. Inner sides of limbs white. Feet below the knees blackish, with slight white lines round the hoofs. Tail thin, above brown like the back, beneath white, tip black; length about 14 inches. Horns rising backwards nearly in a line with the forehead, then turning upwards, strongly ringed; length along the curve about 26 inches. _Female._ Similar to male but hornless, and slightly smaller in size. _Hab._ Senegal and Gambia. The Sing-sing of Western Africa appears to have first come to the notice of European naturalists in the year 1831, when a living pair of this Antelope were brought to England, of which one, we are told, went to the Surrey Zoological Gardens, and the other to the Zoological Society’s collection in Regent’s Park. In the ‘Report of the Council of the Zoological Society,’ read at the Anniversary Meeting in 1832, this animal is entered in the list of mammals exhibited in the Society’s Gardens (drawn up, we believe, by Mr. Bennett) as the “Sing-sing Deer (_Cervus sing-sing_)” In Waterhouse’s Catalogue of the Mammals in the Society’s Museum published in 1838, the same animal (then in the Museum) is entered more correctly as “_Antilope sing-sing_” but the specific term is attributed to “Ogilby.” In neither case, however, was any description added to the specific name. It is curious also that Ogilby, to whom the specific term “_sing-sing_” is attributed by Waterhouse, in his article upon Antelopes published in 1834 in the first volume of the ‘Penny Cyclopædia,’ did not use this name, but referred the animal in question, of which a very fair figure was given, to the “Koba” of Buffon, and called it “_Antilope koba_.” Ogilby appears to have taken the same view in his remarks on certain Antelopes published in the Zoological Society’s ‘Proceedings’ for 1836; but the “Koba” of Buffon, as we have already shown (Vol. I. p. 60), is a name of very uncertain application, and certainly not to be attributed to this species.