48 LLOYD’S NATURAL HISTORY. 
brown and pale yellow (the brown colour gradually coalescing 
above posteriorly to form a dark crest), beneath uniform yellow- 
ish- or brownish-white, tip sometimes yellow. Length of head 
and body about 32 inches; of tail 24 inches. 
Distribution. South Australia. 
This Rock-Wallaby, which is more brilliantly coloured than 
any other member of the family, may be at once recognised by 
its ringed tail. The contrasts in its coloration are too glaring 
to form a pleasing effect. The skull is characterised by the in-' 
flation of the muzzle and forehead, in which respect it makes 
an approximation to that of MJacropus antilopinus. Some 
hundreds of skins are annually imported to London from Ade- 
laide, their value ranging from one-and-fourpence each. The 
skins of the common Rock-Wallaby are less valuable, averaging 
from threepence to ninepence each, although they have been 
known to reach as much as one-and-threepence. 
THE NAIL-TAILED WALLABIES. GENUS ONYCHOGALE. 
Onychogalea, Gray, in Grey’s Australia, Appendix, vol. ii., p. — 
402 (1841). 
Nose hairy, with the exception, in some species, of the base © 
of the septum between the nostrils; central hind claw long, | 
narrow, compressed, and very sharp; tail long, tapering, short- © 
haired, not bushy, more or less crested towards the tip, where | 
it is furnished with a horny nail or spur. 
The three species of Nail-tailed Wallabies, which are confined 
to Australia and unknown in Tasmania, form a well-marked ‘ 
group, distinguished not only by the peculiar horny appendage , 
to the tail, from which they derive their name, but likewise by 4 
the form of their incisor teeth, which are small and light, and | 
decrease evenly in size from before backwards, the middle and | 
outer ones in the upper jaw being very slender, and sloping | 
