Zoological Society. 303 
was proposed to designate O.sculptorum. Mr. Blyth then proceeded 
to distinguish two Himalayan species, which presented a somewhat 
different form of horn from the rest of the genus; one, the Ovis Na- 
hoor, Hodgson, of superior size, and general pale colour, which he 
believed did not inhabit so high; the other he termed O. Burrhel, 
which was of a very dark colour, and presented numerous other spe- 
cific distinctions, being an inhabitant also of more elevated regions. 
The Ovis aries he considered a species per se, and not descended 
from the Mouffion ; and the O, musimon was treated of in detail under 
its two alleged varieties, specimens of which, however, had never 
been compared together. ‘The Izalus probaton, Ogilby, was deemed 
to belong strictly to the genus Ovis, and Mr. Blyth suggested, that 
as the abnormal growth of its hoof indicated that it had long lived 
in captivity, it was not unlikely that castration at an early age may 
have obstructed the developement of its horns, the rudiments of 
which exactly resembled those found upon many breeds of true 
sheep, and upon the lambs of all horned breeds of a certain age. 
The last animal included was the Ovis tragelaphus, Auctorum, of 
which the O. ornata, Geoffroy, appeared to be merely a dwarfish in- 
dividual: the characters of this species were treated of at consider- 
able length, and it was proposed to elevate it to the rank of a sub- 
genus of Ovis, for which the name Ammotragus was suggested. 
The paper was illustrated by numerous elaborate drawings of the 
horns, &c., and by a pictorial group, containing the principal species, 
the relative sizes of which were thus rendered obvious to the eye. 
February 25, 1840.—Prof. Rymer Jones, in the Chair. 
Mr. Ogilby drew attention to a prepared specimen and skull 
of a Gibbon, which had recently died at the Society’s menagerie. 
The precise locality from which this animal was procured had not 
been ascertained; it was presented by John Abel Smith, Esq., and 
after living some months in the menagerie, fell a victim to the same 
complaint which carried off so many of the Quadrumana during the 
past winter. 
The whole body is of an uniform deep black colour, except the 
throat and cheeks, which are covered with long white hair, forming 
a broad band which extends from ear to ear. This circumstance 
induced Mr. Ogilby to propose the name of Hylobates leucogenys for 
this species. ‘There is no white mark over the eyes, as in the Hoo- 
lock, and the chin and under jaw are black, like the rest of the body. 
The head is remarkable for its pyramidal elevation, as contrasted 
with the flattened form of the same part in the Hoolock. Mr. 
Ogilby stated, that the only doubt he had with respect to the spe- 
cific distinction of this animal, is the probability of its being the 
male of that described by Dr. Harlan under the name of H. niger. 
The hair of the forehead and head in general is directed backwards, 
towards the neck: that on the crown of the head is very long, and 
gives to the head that pyramidal or conical form before mentioned. 
The skeleton and dentition show it to have been a young animal ; 
the permanent teeth had not yet protruded from the alveoli. The 
