﻿It 



ALLEN'S naturalist's LIBRARY. 



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 





Left Hind 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 Y\iz\.zxvQ^Q.x{Pseudochiyus). 



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 

 Uiberculated crowns. 



