VIl TREE-KANGAROOS 135 
blance to the English hare,” and ZL. leporoides was so called by 
Gould on account of general appearance as well as face. 
Dorcopsis has shorter hind-legs than MJacropus, and a naked 
mutile. The ears are small. The structure of D. /uctuosa has 
been studied by Garrod,’ who pointed out the existence of four 
enlarged hair follicles on the neck near the mandibular sym- 
physis. These are, however, represented in the next genus 
Dendrolagus, and occur also in Petrogale. The limbs are not so 
disproportionate as in Macropus, and the tail is naked at the tip. 
Dorecopsis and the next genus to be described, Dendrolaqus, 
differ from Macropus and its immediate allies, Petrogale and Lagor- 
chestes, in a number of anatomical points. In the first place, the 
premolars are twice the size of those of Macropus, and they have 
a characteristic pattern not observable in the Kangaroos. This 
consists of a median ridge (the whole tooth being rather prismatic 
in shape), with lateral ridges at right angles to it. The upper 
canines are developed, but are minute. 
The stomach is not quite like that of Macropus, though built 
upon a similar plan. The blind cardiac extremity is a single, not 
a double cul-de-sac ; in this it is like that of Petrogale. The dis- 
tribution of the squamous, white, oesophageal epithelium is very 
much like that of Dendrolagus. In both genera the orifice of the 
oesophagus into the stomach is guarded by two strong longi- 
tudinal folds, which run for some distance towards the pylorus. 
In Dendrolagus, at any rate, this tract is bordered on each side 
by glandular patches. In Dendrolagus, moreover, the squamous 
epithelium does not extend into the cardiae cul-de-sac. This 
latter is separated from the rest of the stomach by two slightly 
diverging folds, which are faintly represented in Petrogale and in 
Halmaturus. In the last two genera the folds surrounding the 
oesophageal orifice are but slightly represented ; better in Halma- 
turus than in Petrogale. But there are not the patches of glands 
already referred to. The small intestine of Dorcopsis is 97 
inches in length, the large being 32, 7.e. proportionately long, as 
in Marsupials generally. The small caecum (24 inches) is not 
saceulated. 
The spleen is Macropodine, being T-shaped or Y-shaped. The 
differences between Dorcopsis and the evidently closely allied 
Dendrolagus will be further considered under the description of 
1 Proc. Zool. Soc. 1875, p. 48. 
