The skull of an adult male gives the following measurements:—Basal length 11·5 inches, orbit to muzzle 6·5, greatest width 4·75. _Hab._ West Africa, from the Cameroons to the Congo. The first allusion that we can find to the occurrence of a species of the Sitatunga-group on the West Coast of Africa is in the Zoological Society’s ‘Proceedings’ for 1848, where it is recorded that the Secretary exhibited, at the meeting on June 13th, the skull and horns of an Antelope closely allied to _Antilope euryceros_, Ogilby, and read a letter in reference to it received from Capt. William Allen, R.N. Capt. Allen described the appearance of the animal from memory only, but stated that he had himself obtained the specimen at a place called Kokki on the Cameroons River. The pair of horns in question are now in the British Museum, and belong, in all probability, to the present species. In 1871 Sir Victor Brooke read an excellent paper on Speke’s Antelope and its allies before the Zoological Society of London. The list of specimens of his _Tragelaphus spekii_ given in the ‘Proceedings’ contains examples of all three species of _Limnotragus_, as we here consider them. The figure (fig. 112, p. 167) of specimen “_g_” (which we are allowed to reproduce by the kindness of that Society) was taken, we believe, from a West-Coast example, and is therefore referable to _L. gratus_. [Illustration: Fig. 112. Horns of Congan Sitatunga. (P. Z. S. 1871, p. 486.) ] In 1880 Mr. Sclater received from Mr. R. W. Rolleston, of Liverpool, a flat skin of the very remarkable red female of this species, said to have been received from Gaboon. This was exhibited and described at the meeting of the Zoological Society on June 15th of that year, and a new species—_Tragelaphus gratus_—was founded upon it. Sclater’s original description was accompanied by a beautiful figure of the animal prepared by Joseph Wolf, and put upon the stone by Smit. Soon after this date Sclater was able to acquire some further information concerning this interesting Antelope. On visiting the Menagerie of the Jardin des Plantes at Paris in the autumn of the same year, his attention was called to a pair of Antelopes lately received from the Jardin d’Acclimatation, which he at once recognized as being the male and female of his _Tragelaphus gratus_. On returning to England, Sclater sent the typical skin of _Tragelaphus gratus_ to Paris for comparison, and convinced M. Milne-Edwards of its identity with the living pair. Visiting the Jardin des Plantes again in 1881, Sclater had the pleasure of inspecting for the second time this fine pair of Antelopes, which were then accompanied by a young female, born in the previous December. Mr. Keulemans, being at that time in Paris, was employed to execute a water-colour drawing of these Antelopes, which was subsequently published in the Zoological Society’s ‘Proceedings’ along with further notes on the same subject. M. Milne-Edwards informed Mr.