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Mr. DuChaillu. We may therefore fairly put down the locality of the specimen 
as Gaboon, to which district of Western Africa both of Mr. DuChaillu’s 
great journeys were confined. As in the former case also, the present species 
was described in the ‘ Annals of Natural History ’ for 1873, in a supplementary 
paper to Dr. Gray’s revision of the species of the present genus published in 
1871. To what extent, however, the present is different from the allied species 
must remain uncertain until further specimens have been obtained, which, so 
far as we are aware, has not yet been the case. 
The typical example of Cephalophus leucogaster is probably a female 
and is quite immature, with the milk-molars still in position and the 
third molar still below the bone, and it is difficult to arrive at a definite 
conclusion from such a specimen. At the same time, as Thomas has 
shown in his article on the genus Cephalophus, published in 1892, it is 
not possible, in the present state of our knowledge, to refer the specimen 
to any described species. The black dorsal band distinguishes it from 
C. nigrifrons and other preceding species, and the white hams and under 
surface from all the forms of the next following species—C. dorsalis—to 
which, perhaps, it most closely approximates. On the whole, therefore, we 
can at present only say that C. leucogaster has been established on a young 
specimen of a species of which the adult form is not yet known to us. 
May, 1895. 
