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C. natalensis. Its most striking characteristic is, however, the fact that its 
hoofs are very much longer than is usual in the genus, an elongation which 
is probably due to its inhabiting marshy and boggy regions, where its long 
hoofs would prevent its sinking so deeply as it otherwise would into the 
muddy soil. 
The typical specimens of this Duiker formed part of the collection made 
by Mr. DuChaillu during his celebrated visit to the Gaboon in 1856 and the 
following years, the greater part of which were ultimately acquired by the 
British Museum. On reference to the ‘Explorations and Adventures in 
Equatorial Africa’ of DuChaillu we can find no reference to it, unless, as is 
probable, it is alluded to as one of the “four species of Gazelle not yet 
determined,” which are enumerated in the appendix. When, however, 
DuChaillu’s specimens came under the experienced eye of the late Dr. Gray, 
on the occasion of his preparing a monograph of the genus Cephalophus 
(subsequently published in the Zoological Society’s ‘ Proceedings’ for 1871), 
it was quickly discovered that amongst them was a representative of a new 
and distinct species of the present genus, which was described and figured as 
C. nigrifrons. Ina subsequent communication to the ‘Annals of Natural 
History’ in 1871, Dr. Gray described a specimen of what he believed to be 
another new species of Cephalophus under the name of C. aureus. On this 
occasion he tells us that the specimens, both of his C. nigrifrons and of his 
C. aureus, “‘had been sent home from Africa by Mr. DuChaillu as materials 
for stuffing out the skin of a specimen” of a larger Antelope (Tragelaphus 
euryceros). We believe it to be the fact that, as Sclater was assured by the 
late Dr. Gray, he described four new species of Antelopes from skins found 
in the interior of this Tragelaphus when it was unstuffed for the purpose of 
being remounted for the collection of the British Museum. As regards the 
so-called C. aureus, however, a close examination of the typical specimen, 
made by Thomas in 1892, convinced him that it was a very young animal 
and was probably only an immature individual of the present species. We 
may observe, however, that its body is far brighter and more fulvous than 
that of the adult, that the withers and shoulders are browner, and that the 
caudal tuft is more abundantly mixed with white. 
In 1882, as recorded in the eighth edition of their ‘ List of Animals,’ the 
Zoological Society acquired by purchase of Mr. Cross, of Liverpool, a living 
specimen of the Black-fronted Antelope, which lived for about three months 
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