132 KANGAROOS AND WALLABIES CHAP. 
prymnus), consists of smaller animals than the Macropodinae, 
which, however, resemble them in having no hallux, but a hairy 
tail. The oesophagus enters the stomach near the pyloric end 
of that organ. The caecum, though short, has lateral longitudinal 
bands. The liver has no special Spigelian lobe. The canines 
are always present, being rarely so in Macropodinae, and are 
usually well developed. 
The third sub-family, that of the HypstpRYMNODONTIDAE, is 
doubtfully referable to the family; it consists of but one genus 
Hypsiprymnodon, which is in many points more like a Phalanger 
than a Kangaroo. It has an opposable hallux and a non-hairy, 
but scaly, tail. It has canines in the upper jaw. 
Sub-Fam. 1. Macropodinae.—The genus Macropus includes 
not only the Kangaroos but also the Wallabies, which are really 
Iga 35 : 
Fic. 66.—Red Kangaroo. Macropus rufus. x 75 
indistinguishable, though they have sometimes been placed in a 
separate genus Halmaturus. The genus thus enlarged contains 
twenty-three species. It may be thus characterised: the ears 
are long, the rhinarium is usually naked, but in JZ giganteus 
and others a band of hairs descends to the upper lip; a 
naked band extends from the ankle to the pads on the digits, 
which is interrupted in MZ. rufus by a band of hairs just in front 
of the digits. The mammae are four. The tail is not bushy, 
