Horns, in proportion to the size of the animal, longer than in the Oribis, very slender, smooth, and practically unridged throughout. Their direction is nearly vertical, and they are slightly curved forwards. Dimensions, ♂:--Height at withers 19·5 inches, length of hind foot 9·7, ear 4·2. Skull: basal length 4·86 inches, greatest breadth 2·68, muzzle to orbit 2·6. _Hab._ South Africa, from the Cape to the Zambesi and on the west to the Cunene. The Steinbok became known to the Forsters and Thunberg through the Dutch settlers at the Cape at about the same date as the Grysbok, and in 1811 received the scientific name _Antilope campestris_ from the latter author in his memoir, published by the Academy of Sciences of St. Petersburg, to which we have already alluded. Three years later Lichtenstein in his article upon the species of Antilope published in the Magazine of the “Gesellschaft naturforschender Freunde” of Berlin, proposed the name _Antilope tragulus_, but under this designation united both the Steinbok and the Grysbok, as well as the pale variety of the latter species which the Dutch settlers called the “Bleekbok.” In uniting the Steinbok and Grysbok under one head Lichtenstein was clearly in error, the structural difference presented by the absence of accessory hoofs, as well as the divergence in the colour of the fur, sufficiently distinguishing the present species from the Grysbok. Lichtenstein no doubt derived his ideas upon this subject from Forster’s manuscripts, as the same view is taken in Forster’s posthumous work ‘Descriptiones Animalium,’ when it was tardily published in 1844. Under these circumstances there can be no doubt, we think, that “_campestris_” is the proper specific term to be employed for the present species. In an article upon the Ruminants published by Blainville in the ‘Bulletin of the Société Philomathique’ for 1816 and subsequently enlarged in the ‘Journal de Physique,’ that author described and figured the skull of a specimen which he had observed in the Museum of the Royal College of Surgeons in London and called it _Antilope acuticornis_. On Blainville’s description and figure of this skull Hamilton Smith, in the fifth volume of Griffith’s Cuvier, subsequently established a new genus of Antelopes, “_Raphicerus_.” Whoever consults this figure and compares it with a skull of the Steinbok will inevitably come to the conclusion that the figure represents the skull of that animal. We have accordingly added _Antilope acuticornis_ of Blainville, and the further references to it subsequently published, to the synonyms of the Steinbok, and under these circumstances have thought it necessary to give the generic term _Raphicerus_ precedence as the generic name of the present group over the better known names _Calotragus_ of Sundevall and _Pediotragus_ of Fitzinger.