54 
MAMMALIAN GALLERY. 
their short fore feet to the ground only when feeding or walking. 
Their hind feet are of very peculiar structure, the great mass of 
the foot being made up of the much-developed fourth toe, while 
the first, corresponding to our great toe, is entirely absent; and 
the second and third, although long, are so slender and w'eak as 
to be quite useless, and are bound up in a common skin to the 
nails. This structure of the foot is not confined to the Kangaroos, 
but is also found in certain of the other families. 
Kangaroos vary in size from species as large as a man to 
others smaller than a rabbit, such as the Kat- Kangaroos {Hijpsi- 
Fig. 20. 
Kangaroo from Ne\v South Wales (Ilahnaturus jmrnji). 
prymniis or Potorous). Of those exhibited may be specially 
mentioned the Great Woolly Kangaroo (^Macropus rvfus), the 
largest of the family, and the beautiful Yellow-footed Wallaby [Pe- 
trogale xanthopus) most brightly coloured species of the family. 
2. The Phalangers {Phalangeridoi) form a large and varied 
group, to which belong: — 
