ONYCHOGALEA UNGUIFER, Gould. 
Nail-tailed Kang*aroo. 
Macropus unguifer, Gould in Proc. of Zool. Soc., part viii. p. 93. — Ib. Mon. of Macropodidse, pi. . — Gray, List 
of Spec, of Mamm. in Coll. Brit. Mus., p. 88. — Waterh. Nat. Hist, of Mamm., vol. i. p. 75. 
This very elegant little Kangaroo, of whlcli I have only seen a single example, was liberally placed in rny 
hands, for the purpose of being described and figured, by Mr. Bynoe, of Her Majesty’s Ship the Beagle, who 
had obtained it on the north-west coast during the present expedition of that vessel, whose captains and 
other officers, not only in this, but in her former voyage, have so largely extended our knowledge of the 
zoological productions of the little-known countries they have visited in the course of their explorations. 
This animal peculiarly attracts our attention by the circumstance of its possessing a character not found 
in any other known member of its family, namely, a broad flattened nail much resembling that of the finger, 
situated at the extremity of the tail, but which is not ordinarily observable, from its being hidden in the tuft 
of long black hairs clothing the apical portion of that organ. It is true that a somewhat similar character 
exists in the Onychogalea frcBnata, but in that species it is merely rudimentary. 
The foregoing remarks were published in my Monograph of the Kangaroos, and although nearly twenty 
years have since elapsed, no additional information has been obtained, nor has any other specimen than the 
original one in the British Museum been procured ; it consequently still remains unique. It may be as well, 
however, to add Mr. Waterhouse’s opinion respecting this animal, since it tends to establish a species 
dependent upon the skin of a single specimen ; though no doubt could, I should suppose, be entertained by 
any one on this point, since the extreme elegance of the animal, both in shape and colour, and its lengthened 
tail terminated with an extraordinary-shaped nail, serve to distinguish it from every other known species. 
“ The muffle in 0. unguifer ” says Mr. Waterhouse, “ is covered with hair, with the exception of a very 
narrow margin next the nostril-openings : the foremost of the three incisor teeth on either side of the upper 
jaw is distinctly the broadest, the other two are very nearly equal in width ; the hindermost has a strong 
oblique external fold ; these teeth are small compared with the incisors of most Kangaroos. A canine tooth 
is present, but it is very small. The tarsi are very long and slender ; the ends of the nails of the double inner 
toe terminate 2^ inches short of the end of the nail of the great central toe, and the tip of the nail of the 
outer toe is 1-|- inch short of the same point ; the nails of the two larger toes are long, narrow, and much 
compressed above. The nails of the finger are rather short and broad.” 
Fur very short and moderately soft ; general colour huffy yellow, extending on to the outer side of the 
legs and the base of the tail, and gradually passing into the all but pure white of the head, ears, legs and 
under surface; on each side of the body just before the knee a pale rusty patch; a brownish mark com- 
mences about the middle of the back, runs backward over the rump, and extends to about four inches along 
the upper surface of the tail ; arms and tarsi cream-white ; an indistinct yellowish-white mark, curving 
upwards, crosses the thigh at the base; middle portion of the tail brownish, the tip being clothed with a 
long black tuft, in the centre of which is a thinnish black nail half an inch in length and a quarter of an 
inch in breadth, convex above and concave beneath, considerably resembling the nail of the human finger. 
Length from the nose to the extremity of the tail 
„ of tail 
„ „ tarsus and toes, including the nail 
„ ,, arm and hand, including the nails 
„ ,, face from the tip of the nose to the base of the ear 
feet, inches. 
4 4 
2 2 
5 
4i 
2i 
One of the accompanying Plates represents the head and fore part of the body, and two views of the 
extremity of the tail, all of the natural size ; the other Plate, reduced figures of the entire animal. 
