— 53 — 
ticuliar in making this last observation, because tbe organs in 
question had not been previously recorded as existing in tbe 
Colobi, and because G. Saint-Hilaire in bis valuable lectures, of 
,which it is a matter of great regret that so small a portion bas 
been given to tbe public, even doubts their existence. Of this 
however, tbere can be no longer any reasonable doubt; they are 
extremely apparent and ratber capacious in this specimen now 
under description » ; it is may here be remarked that Illiger, who 
etablished tbe Genus, and that Desmarest (1) who drew ut is cha- 
racter from Geoffroy, expressely affirm tbe presence of cbeek 
poucbes; and Geoffroy in bis lectures says : «Leurs abajoues 
sont assez développées ». Setting aside, however, Illiger, Des- 
marest and Geoffroy it is to be observed that tbe author of this 
work bas carefully examined the specimen in which Ogilby 
considers tbe cbeek poucbes to be both apparent and capacious; 
and though be hésitâtes in differing from so judicious a Natu- 
ralist, yet he cannot belp confessing that to felt be no means 
satisfied as to their real existance. It is true that there is a vacuum 
between tbe skin of the cbeeks and the jaw bon es. — A. vacuum 
not bounded posteriorly, as cbeek poucbes are, but communi- 
cating witb tbe bollow skin of tbe neck. Now, in effecting tbe 
préparation of the specimen — and tbe remark applies to others 
also, — the skin of tbe head bas evidently, been separated from 
tbe boues, and after the application of tbe ingrédients used, in 
preserving it, returned to its former position ; hence, in drying, 
the skin no longer adhering to the bones of the jaws, a space 
between the skin and jaws would naturally be tbe résultat; and 
in a specimen so prepared, it would be difflcult to say whether 
the vacuum thus presented, indicated capacious cbeek poucbes, 
or was marely a conséquence of tbe flaving of the head, and tbe 
subséquent contraction of the skin in drying. The fact is, that in 
dryed specimens, as they are usually prepared, it is very diffi- 
cult, if not impossible, to acertain precisely wether, in tbe living 
animais, cheek poucbes bare présent or not, and in this predi- 
carnent stands tbe Genus Colobus. » 
(1) Desmarest also gives cheek poucbes as characteristique of the Genus 
Semnopühecus, a palpable error proving now cautiously, the assertion of the 
most accurable Naturalists arc to be received. 
