GUAYS HAT - KAN G A HO 0. 
208 
Zool. Soc. 
Coll. Surf. 
Inclies. Line#. 
Inches. Lines. 
Width of inter-orbital space . 
Length of three upper incisor teeth, taken 
0 
91 
0 
91 
together ... ... ... ••• 
0 
4 
0 
Distance between incisors nnd canine tooth 
0 
1 
0 
i 
'* canine and premolar ... 
0 
H 
0 
4 
Length of permanent premolar ... 
11 of the premolar and four true 
0 
3ft 
0 
3ft 
molars, taken together 
... 
... 
1 
01 
HYPSIPRYMNUS (Bettonyia) GRAIL 
Gray's Rat-Kangaroo. 
Hypsiprymnus Graii. Gould, Proceeding# of the Zoological Society for 
December, 1810, Pt. 8, p. 178; Waterhouse, 
Marsup. p. 190. 
Hypiiprymnus Lerueuri (?) Quor et Gaimard, Voyage de la Coquille. 
Fur ashy grey, pencilled with white, or brown, pencilled with 
rusty white; under parts pale yellow: tail rusty brown 
above, assuming a deepish brown hue towards the apex ; 
usually about two inches of the apical portion white; tarsi 
brown-white, or very pale rusty brown : head usually suffused 
with yellow, especially on the sides ; foremost pair of incisor 
teetli rather broad, not compressed. Skull, Plate 10, fig. 3. 
Inhabits Western and Southern Australia. 
The present species of Rat-Kangaroo, which is named in 
honour of Mr. Gray, head of the Zoological Department of 
the British Museum, inhabits both die Western and Southern 
districts of Australia, and in both districts is associated with 
the S,penicillatus (or at least with the H. Oyilhyi , which I 
regard as a variety of that animal). 
Many specimens of H. Graii have come under my notice, 
and although diese exhibited considerable variation in their 
colouring, and somedmes approximated very closely to other 
species, yet, with the assistance of the skull, 1 have found no 
difficulty in distinguishing them. Some individuals might be 
confounded with the H. Gaimardi , and others again approxi- 
