484 Zoological Sociehj. 



\inc. lin. 



Longitude ab apice rostri ad caudse basin. ... 5 3 



caudce 3 5 



tarsi digitorumque 1 1^ 



auris 9^ 



Hab. Bolivia, near Potosi. 



The most striking features of this species are the large size of its 

 ears, combined with its delicate ochre-yellow colouring. It is ap- 

 parently a stout-bodied animal, and has long and soft fur, which on 

 all parts of the body is of a deep slate-grey colour next the skin ; on 

 the under parts each hair has the outer half white ; on the sides of 

 the body the visible portions of the hairs are ochreous, obscurely 

 tinted with rufous on the rump : the hairs on the back are similarly 

 coloured, but they are brown at the point, and many of them are 

 blackish. The feet are white, but slightly suffused with yellowish ; 

 the tail is well-clothed for a mouse, white beneath, and of a pale 

 yellow colour above ; the eyes are margined with brown ; the ears 

 are clothed with small pale yellow hairs internally, and the hairs on 

 the outer surface, which are much longer, are of a rusty yellow hue. 

 The hairs of the moustaches are numerous and very long, some of 

 them white and some black. The incisor teeth, which are narrow 

 in proportion to the animal, are of a very pale orange colour. The 

 fore-feet are small ; the tarsi moderate. 



The Hesperomys boliviensis, in the large size of its ears, must ap- 

 proach the Mus auritus of Desmarest ; but judging from the descrip- 

 tion of that animal, it should differ in being of a larger size, in having 

 the tarsi shorter in proportion, and its colouring must be very dis- 

 similar, the M. auritus being described as of a grey hue. — G. W. 



February 24. — George Gulliver, Esq., F.R.S., in the Chair. 



A paper by Edward Fry was read : — 



" On the Osteology of the Active Gibbon {Hylobates agilis)." 



I have never met with any detailed account of the osteology of 

 any species of the genus Hylobates. Professor Owen's memoir on 

 that of the Orang Utan and Chimpanzee seems to make one de- 

 sirable, for the sake of comparison, as the Gibbons are the next group 

 of Simiadcc to the Orangs. Their skeleton too is highly interesting, 

 as exhibiting a striking adaptation to progression amongst the 

 branches of trees, well-fitting the animal to be a walker amongst 

 woods, a Hylobates. 



The individual, whose skeleton I am about to describe, was a female, 

 which lived for some years in the Zoological Gardens at Bristol, having 

 been brought thither from Macao, where she had been kept in con- 

 finement. Of two young ones which were taken with their mother 

 in the forests of Malacca, she alone attained maturity. She was pro- 

 bably nine or ten years of age at the time of her death. Of her 

 agility and her cry I shall say nothing; much has already been 

 written on these subjects, and no account of mine could give any 

 adequate impression of her wonderful manners. 



This individual is the one which was exhibited in London in 1 840, 



