The Kangaroos vary considerably in size and in the form of their teeth; and the smaller species are generally furnished with strong canines. Some of them have prehensile tails, and they can ascend small trees; others have long pliable tails and very short tarsi; these are known as Rock-Wallabies or Rock-Kangaroos, and frequent mountain districts. Others again possess short stiff tails and long heads; they resemble in appearance the Bandi-coots, and where on the one hand the prehensile-tailed group of Bettongs approaches the Phalangers we observe on the other side, in the Rat Kangaroos, an inclination to the Bandicoot family in their elongated skulls and stiff and short tails.

Space will not permit to go into detail, and we divide the family as follows :—

A.—Large Kangaroos with small premolar teeth, which are soon lost.