In 1827, in his volume on the order Ruminantia in ‘Griffith’s Animal Kingdom,’ Major Hamilton Smith described a female of this species which had been brought home from Sierra Leone by Col. Charles Maxwell and dedicated it to that gentleman as _Antilope maxwelli_. In a subsequent volume of the same work, containing a synopsis of the species of mammals, Hamilton Smith not only repeated the description, but added, as apparently different, a description of another young specimen from the same country, and classed it as a different species under the name _Antilope philantomba_. Under this last designation also this Antelope is mentioned by Ogilby in the ‘Proceedings’ of the Zoological Society for 1836, where he gives some particulars respecting two females which had lived for some time in the Society’s Gardens. At about this date also there were several examples of the “_Philantomba_” as it is commonly called in Zoological Gardens, living in the Derby Menagerie at Knowsley. In Waterhouse Hawkins’s drawings of the animals in this splendid collection, which were subsequently edited by Gray, Maxwell’s Duiker appears to have been mentioned under three different names--first as _C. maxwelli_ (plate xi. _a_), secondly as _C. punctulatus_ (p. 11), and thirdly as _C. whitfieldi_ (plate xi. fig. 2). So far as we can tell all these names must refer to the present species, which seems to vary considerably between youth and age. Many living specimens of this Duiker have also been received by the Zoological Society of London, besides those mentioned by Mr. Ogilby. Although in nature shy and retiring it does well in captivity, and becomes very tame when petted. It has frequently bred in the Society’s Menagerie, and specimens are registered as having been born there in 1867, 1871, 1872, 1873, and 1874. It is also well known in several of the Zoological Gardens on the Continent. Of late years there have been many examples of this little Antelope in the Zoological Gardens at Amsterdam, and there are at present two males in that Collection. [Illustration: Fig. 20. Skull of _Cephalophus maxwelli_. (P. Z. S. 1871, p. 600.)] It has been stated by some authors that the female of this species is hornless, but of those in the Zoological Society’s Collection it is certain that both males and females have carried horns, though these appendages are usually rather smaller in the latter sex. As regards the specimens in the Zoological Gardens at Amsterdam, Mr. F. E. Blaauw likewise assures us that all the females have had horns, sometimes larger and sometimes smaller. We therefore regard the absence of horns in adult females of this species as an exceptional occurrence.