There is a good mounted specimen of an adult male of this Antelope in the Gallery of the British Museum, obtained by Mr. F. J. Jackson in the Kilimanjaro district of British East Africa and presented by him. Mr. Jackson has also given the Museum a fine skull of an adult male from the same locality, and has placed at the service of the Museum three other mounted heads of this Antelope. The National Collection also contains skulls of an adult pair of Grant’s Gazelle from Kilimanjaro presented by Mr. W. Carlisle Fraser, and several skulls and skins of different ages from Machakos, collected and presented by Mr. S. L. Hinde. Besides these some skulls and skins obtained during the Cavendish expedition to Lake Rudolph, and presented by Mr. H. S. H. Cavendish and Mr. H. Andrew, have lately been added to the series. Our illustration of this beautiful Antelope (Plate LXIX.), which shows the horns of the male in various attitudes, was prepared by Mr. Wolf under Sir Victor Brooke’s directions and drawn upon the stone by Mr. Smit. We are not sure as to the specimens from which it was taken. _September,_ 1898. 101. PETERS’S GAZELLE. GAZELLA PETERSI, GÜNTH. _Gazella granti_, =Peters=, MB. Ak. Berl. 1879, p. 832, pl. v. (skull). _Gazella petersi_, =Günth=. Ann. Mag. N. H. (5) xiv. p. 428 (1884); =Lyd.= Horns and Hoofs, p. 238 (1893); =Jackson=, in Badm. Big Game Shooting, i. p. 299 (1894); =A. Neumann=, Elephant-Hunting in E. Africa, pp. 9, 10 (figs., horns, ♂ ♀) (1898). _Gazella grantii_ var. _gelidjiensis_, =Noack=, Zool. Gart. xxviii. p. 277 (1887). VERNACULAR NAME:--_Sala_ (Swahili) (_Fischer_). Size large; height at withers about 33 inches. General colour and markings practically identical with those of the last species, _Gazella granti_, with the exception that the white rump-patch is of much less extent. This patch, which in _G. granti_ is very broad, and projects prominently forward on each side, overhanging the dark pygal band, and passes across above the tail, separating that organ entirely from the dark dorsal colour, is in _G. petersi_ divided above into two portions by an extension of the body-colour which runs down on to and along the top of the tail. Laterally the white is much narrower, and encroaches much less on the body-colour above, scarcely or not at all overhanging the pygal band. Skull rather smaller than in _G. granti_, and the nasal opening rather narrower. Basal length in a male 9·3 inches, greatest breadth 4·2, muzzle to orbit 5·4. Horns similar to those of _G. granti_, but smaller and more uniformly parallel, never widely divergent above. Horns of female about two-thirds the length of those of the male, slender and comparatively straight. _Hab._ Coast-districts of British East Africa, from Mombasa northwards to beyond the Tana.