THE WHITE EYELID MONKEY. 
Cercocebus fuliginosus. Geoff. 
Although we have adopted M. GeofFroy- Saint- Hi- 
laire's name for this and the succeeding animal, we 
are by no means satisfied that they ought to be sepa- 
rated from the genus Cercopithecus, with the genuine 
species of which they agree in all the most essential 
particulars. Their facial angle, it is true, is rather more 
prolonged, and does not, at the adult age, exceed 45° ; 
the margins of their orbits are somewhat more elevated ; 
their cheek-pouches and their callosities are propor- 
tionally larger ; and their limbs are more slender and 
elongated : but these are merely differences of degree, 
and are not connected with any essential variation in 
dentary character or geographical distribution. 
This Monkey was called by Buifon the Mangabey, 
from an erroneous idea that his specimens were obtained 
from the territory of that name in the Island of Mada- 
gascar : it appears, however, more probable that it is 
