I frankly admit that I am more doubtful how to decide the question whether we can at present assume that there are several or only one species of chimpanzees. _Troglodytes niger_ has always been regarded by me as to a certain extent a typical form of this animal, and in the second chapter of this work I selected it as the subject for my general description. It is this type of chimpanzee which has usually reached Europe from the West Coast of Africa. The face of this animal is moderately prognathous; the head, even in aged males, is round, the ears are large and of somewhat the form presented in Fig. 6, the skin is of a dirty flesh-colour, and the hair is black. Reichenbach’s _Pseudanthropos (Troglodytes) leucoprymnus_[96] is only so specified on account of the whitish hair which clothes its posterior--a character observed in all true chimpanzees, and therefore without specific value. Lainier, the keeper of the Museum at Havre, has had an illustration made from a damaged skin of a large (probably male) chimpanzee; but we can only form an imperfect opinion of its general external appearance from this figure.[97] There is as little certainty about Gray’s _Troglodytes vellerosus_ from the Kamarum mountains.[98] Duvernoy’s remarks on _Troglodytes Tchégo_, which he asserts to be a new species, relate to an aged male specimen of which the form is also doubtful. From the materials brought home by Du Chaillu, Jeffries Wyman has sought to establish two new species of anthropoids, the Nschiego Mbouvé (_Troglodytes calvus_) and the Koolo-Kamba (_Troglodytes Koolo-Kamba_). I have vainly endeavoured to obtain a satisfactory account of these two supposed new species from the descriptions which are intended to establish them. The whole matter is unfortunately rendered more confused by the illustrations he subjoins. That of the Nschiego Mbouvé is only taken from a very badly stuffed skin of a chimpanzee, that of the Koolo-Kamba from the skin of a female gorilla. But we may come to the general conclusion that there are, in fact, not inconsiderable, and perhaps even specific, variations from the ordinary type of chimpanzee. [Illustration: Fig. 61.--Mafuca.]