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Size small; form slender. General colour partly bright yellowish rufous, 
and partly a peculiar bluish grey; the former colour covering the sides of the 
face, the whole of the neck, the shoulders, flanks, rump, and belly, while the 
latter prevails on the middle line of the nose, on the forehead, occiput, back 
of ears, centre of back from withers to rump, and all four limbs, from the 
elbows and middles of lower legs downwards. Crest long, blackish. Tail 
rufous above basally, black terminally. 
Horns placed in the same line as the nasal profile; those of male short, 
conical, pointed (but no adult wild specimen is available for description) ; 
those of female rudimentary, mere low rounded knobs, hardly projecting 
above the skin of the head. 
Skull with a long and slender muzzle. Anteorbital fossee remarkably deep, 
more so than in any other species. Mesial palatal notch about a quarter of 
an inch anterior to the lateral ones. 
Dimensions :— 6. Height at withers 14 inches, ear 2°3, hind foot 7. 
Skull (2): basal length 5-2, greatest breadth 2°6, orbit to muzzle 2°9. 
It is difficult to say to which of the other species this peculiar little animal 
is most nearly allied, especially in the absence of wild-killed male specimens 
with fully developed horns. 
‘Hab. West Africa, from Gambia to the Niger. 
The ninth and last species of the group of Bay Duikers, though agreeing 
with the preceding species in its generally rufous coat, is distinguishable by 
its smaller size and lighter colour. The front and dorsal stripe are of a 
peculiar bluish grey instead of being black, and the whole of the flanks and 
sides are of a light yellowish rufous. 
The Red-flanked Duiker, as we propose to call it, appears to have been 
confounded by Desmarest, Lesson, Gervais, and other French systematists 
with the Antilope grimmia of Pallas, which is C. coronatus—both they and 
the latter ignoring the fact that the name ‘“‘ grimmia” properly belongs to the 
Common Duiker, C. grimmé, of the Cape. This confusion was first properly 
cleared up by Dr. Gray, as early as 1846, but it is only quite recently that 
the correct names for the three species have come into general use. 
Desmarest, in his article on “ Antilope,” published in 1816 in the ‘ Nouveau 
Dictionnaire d’Histoire Naturelle, was the first describer of the present 
animal under the name of Antilope grimmia; and in 1821 F. Cuvier, in his 
