THE NAIL-TAILED WALLABIES. 49 
markedly forwards. The use of the horny spur to the tall— 
paralleled elsewhere among Mammals only in some individuals 
of the Lion—is at present quite unknown. 
I. NAIL-TAILED WALLABY. ONYCHOGALE UNGUIFERA. 
Macropus ungutifer, Gould, Proc. Zool. Soc., 1840, p. 93. 
Onychogalea unguifer, Gray, List Mamm. Brit. Mus., p. 88 
(1843). 
Halmaturus unguifer, Schinz, Synops. Mamm., vol. 1., p. 547 
(1844). 
Onychogalea annulicauda, De Vis, Proc. Roy. Soc. Queensland, 
MOle1,, p. 157 (1884). 
Onychogale unguifera, Thomas, Cat. Marsup. Brit. Mus., p. 74 
(18388). 
Characters.—Size large ; form light and slender; nose broad, 
partially haired ; fur thick, close, and rather short. General 
colour rich sandy-fawn, with a darker band down the back ; 
under-parts white; ears thinly clothed with white hairs; an 
‘indistinct white mark behind the elbow; a white hip-stripe ; 
limbs white, with the exception of the back of the hind legs, 
which is fawn. Tail very long, white above, sandy-grey 
_ beneath, the terminal third with brown rings, gradually darken- 
| ing posteriorly, and finally coalescing with the black tufted tip, 
_also forming a crest on the upper surface ; terminal nail large, 
flattened laterally, and corfcealed by the pencil of hairs. 
Length of head and body about 26 inches ; of tail about the 
_ same. 
Distribution. —North-western and Northern Central Australia. 
| This species, of which the habits appear to be quite un- 
. known, was first made known to science through a specimen 
, brought home by Mr. Bynoe, of H.M.S. “ Beagle.” 
| 2 E 
