138 MUSK-KANGAROO CHAP. 
B. lesuewri burrows in the ground, often toso great a depth as 10 
feet. The genus occurs in Tasmania as well as in Australia. 
Caloprymnus, with one species, is a genus instituted by Mr. 
Thomas in his Catalogue of Marsupials for a form (C. campestris) 
which combines in a remarkable way the characters of Aepyprym- 
nus, Bettongia, and Potorous. The external characters and the 
general shape of the skull are as in Bettongia, while the molars 
have the structure of those of Aepyprymnus. The last premolar 
is as in Potorous. 
Of the genus Potorous there are three species, which are 
Tasmanian as well as Australian. Unhke the other Rat- 
Kangaroos, the hind-feet are comparatively short, and the animal 
is therefore less addicted to Jumping than its relatives. The 
rhinarium is naked, and the ears are of fair length. 
Sub-Fam. 3. Hypsiprymnodontinae.—The Musk-Kangaroo, 
Hypsiprymnodon, is the last genus of the present family, and the 
only genus of this sub-family. It is intermediate between the 
Macropodidae and the Phalangeridae, the annectant character 
being mainly the hind-feet, which though they have the same 
long fourth digit as the Kangaroos, have it more feebly developed, 
and possess also an opposable hallux, which is one of the salient 
features in the structure of the Phalangeridae. The tail is naked 
and scaly; the rhinarium is entirely naked. The ears are large 
and not furry. The single species, H. moschatus, appears to feed 
upon insects as well as vegetables. 
“Tts habits are chiefly diurnal, and its actions when not dis- 
turbed by no means ungraceful. It progresses in much the same 
manner as the Kangaroo- Rats (Potorous), to which it is 
closely allied, but procures its food by turning over the débris in 
the scrubs .in search of insects. worms, and tuberous roots, 
frequently eating the palm berries, which it holds in its fore- 
paws after the manner of the Phalangers, sitting up on its 
haunches, or sometimes digging lke the bandicoots.” This is 
Mr. Ramsay’s description of the animal, which he was the first 
to discover." 
Fam. 2. Phalangeridae.—The genus Hypsiprymnodon bridges 
over the not very wide gap which separates the Kangaroos from 
the Phalangers. The Phalangers are Marsupials with five fingers 
and toes; the second and third toes are bound together by a 
1 Proc. Linn. Soc. N.S. Wales, i. 1877. p. 34. 
