12 LLOYD'S NATURAL HISTORY, 
two subdivisions of the Diprotodonts by the following char- 
acters: All the teeth are rooted, and there are three pairs of 
upper and one of lower incisors, while there may be a small 
canine in the upper jaw ; the lower incisors being nearly hori- 
zontal, and frequently working against one another like the 
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Left Ilind and Fore Foot of a Kangaroo (reduced), and the corresponding 
but opposite Feet of a Rat-Kangaroo (Potorous). For comparison are 
added figures of the Fore and Hind Foot of a Phalanger (Pseudochirus). 
blades of a pair of scissors. The number of cheek-teeth on 
each side of both the upper and lower jaws is six (although 
some of the earlier ones may be lost in the adult) ; and of these 
the four true molars may have either transversely ridged or 
tuberculated crowns, 
