RAT-KANGAltOO. 
227 
New South Woles, and the same animal is certainly common 
in Van Diemen’s Land. To describe its colouring would bo 
to repeat the description already given of II. murinus: I will 
therefore merely add its dimensions, together with those of 
two similar animals from Van Diemen s Land. 
H. myosurus, 
Ogilby. 
Van Diemen’s Land 
Specimens. 
Inches. Lines. 
Inches. Lines. 
Inches. Lines- 
Length from tip of nose to root of tail 
15 0 
13 6 
19 0 
44 of tail 
10 6 
9 6 
9 10 
44 from nose to ear, about 
3 11 
3 11 
4 2 
44 of ear .. .. 
1 2 
1 2 
1 3 
44 of tarsus, including the claws 
3 4 
3 2 
3 3 
The dimensions contained in the second and third columns 
are from specimens contained in the British Museum, both of 
which are males. The original of Mr. Ogilbv’s description of 
H. mt/osurus is also a male. 
The animal figured by White was a female, and other spe¬ 
cimens having the same proportions in the skull, which have 
come under my notice, have been females, whilst those in 
which the skull resembled fig. 2 of Plate 8 were males. The 
dimensions of die skull, fig. 2, (winch forms part of the 
British Museum collection), are contained in the third 
column of measurements given on the next page. The 
dimensions in the fourth and filth columns are from crania 
in the Royal College of Surgeons: diey differ from the 
skull of Potoroo of White, (PI. 8, fig. 3,) chiefly in being 
larger, in having the muzzle proportionately more elongated 
and narrower, and in the frontal hones being produced on 
either side into a small post-orbital process. With regard to 
this last-mentioned character, I must observe, however, that in 
