380 « Natural-Historical Collections. 
designates it, that of Rollewai, appears more certainly to belong to it; for the 
same appellation is used by Wolf in his account of his residence iu Ceylon, first 
printed at Berlin in 1782, and afterwards in English at London in 1785, and is 
evidently applied to the same species. Its coincidence with the name given by 
Allamand to the Diana appears to have misled the editer of the latter work ; 
but the descriptions both of Thunberg and Wolf differ so completely from that 
species, which is known to be a native of the western coast of Africa, that there 
can be no risk of their being regarded as the same by any scientific naturalist. 
The name of Roloway, as ealicd to the Diana, must either be a purely acci- 
dental resemblance to that of the Ceylonese animal; or, which is the more pro- 
bable conjecture, must have been transferred from it to the African, by the igno- 
rance or carelessness of the showman from whom M. Allamand received it. The 
similarity of sound, connected with absolute identity both of locality and habits, 
would tempt us slso to associate with the present species the Rillowes of Knox’s 
Historical Relation of the Island of Ceylon, were it not that there are some 
points in his description of those animals which could scarcely be recon- 
ciled with such a combination. It is more than probable that many of the 
earlier accounts of the large gray Monkeys of Bengal and the Malabar coast, 
«hich are spoken of by travellers as objects of veneration to the natives, and 
which have been usually referred to the Malbrouck of Buffon, are in reality ap- 
plicable to the animal now before us. The Malbrouck, there is every reason to 
believe, does not inhabit India, but is, like all the other Cercopitheci, a native of 
Africa. 
- The genus Semnopithecus of M. F. Cuvier, of which the Entellus offers a 
truly characteristic example, is distinguished from the other Monkeys of the 
Old World by several remarkable characters, afiecting not only its outward form 
but also some essential parts of its internal organization. In the degree of their 
intellige ence, the form of their heads, and the general outline of their proportions, 
the species which compose it seem to occupy an intermediate station between 
two other purely Asiatic groups, the Gibbons of Buffon, which are the Hylebates 
of modern systematists, and the Macaques, of which the Wanderoo may be re- 
garded as the type. Their bodies are slightly made; their limbs long and 
slender ; their tails of great length, considerably exceeding that of the body ; 
their callosities of small size ; and their cheek-pouches, in those species which ap- 
pear to possess them, so inconsiderable as scarcely to deserve the name. The 
character, however, which at once distinguishes them from the Cercopitheci, 
is found in their dentition, and more particularly in the form of the crown of the 
last molar toath of the lower jaw, which, instead of four tubercles, one at each 
angle of the tooth as in the latter genus, offers five such projections on its sur- 
face, the additional one occupying the middle line of the tooth, and being placed 
posteriorly to the rest. The Gibbons and the Macaques are also furnished with 
this additional tubercle. 
In the shape of their heads, and the expression of their physiognomy, the 
Semnopitheci bear so close a resemblance to the Gibbons, that it would be difii- 
cult to decide from an inspection of the head alone to which of the groups any 
particular species ought to be oe In the earlier stages of their growth the 
forehead is broad and elevated, the cavity of the aed proportionally large, 
and the muzzle but slightly prominent. But as they advance in age the forehead 
gradually diminishes in size, contracting in a remarkable degree the dimensions 
of the cavity within, and the muzzle is prolonged toa considerable extent. These 
changes, which are common to the whole tribe, but are peculiarly striking in the 
present genus in- consequence cf the prominence of their foreheads in the young 
state, are accompanied by a ccrresponding change in the habits of the animals. 
When taken at an early age they are readily tamed, become playful and familiar, 
are extremely agile, although generally calm and circumspect in their motions, 
and learn to perform a variety of tricks, which a execute with no little cunning 
and address. After a time, however, their playfulness wears off ; their confidence 
is succeeded by mistrust; their agility settles down inte a listless apathy ; and 
