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POPULAR SCIENCE REVIEW. 
in the minuteness of all the toes but the fourth, upon which 
alone the creature walks, while its front feet are each reduced 
to two functional digits. 
No other known beast besides walks upon a single toe in each 
hind foot, save the horse family (horses, asses, and zebras), and 
they walk upon a different one, namely, that which answers to 
our middle-toe, while Chceropus walks on the next outer one or 
fourth. No known beast besides Chceropus w 7 alks upon two toes 
in each fore foot, save hoofed creatures, such as the ruminants 
and their allies ; but in them it is the third and fourth toes that 
are used, while in Chceropus it is the second and third toes. 
Fig. 7. 
The Koala ( Phascolarctus ). 
Another animal, called a phalanger (of the genus Phalan - 
gista ), is a type of a third family of the kangaroo’s order ; the 
Phalangistidce , a family made up of creatures which live in trees 
and are nocturnal in their habits, feeding upon fruits and leaves. 
Here we find the limbs of nearly equal length. Once more we 
have I -§-, and we still have the second and third toes united in 
a common fold of skin ; but the innermost toe (that answering 
to our great toe) is not only largely developed, but is like that 
of the apes, directed outwards, and capable of being opposed to 
the other toes, as our thumb can be opposed to our fingers. 
Some of these creatures have prehensile tails. Others have 
the skin of the flanks enlarged so as to serve them as a para- 
