60 MACROPUS. 
21b. M. GIGANTEUS, var. MELANOPS, Gould (1842). 
Black-faced Kangaroo. 
Differs from the typical form only in the much smaller size, 
lighter build, and darker color. A brown patch on the face con- 
necting the two dark whisker-marks. Arms and legs not paler 
than the body ; fingers and toes black. 
Dimensions.—Head and body about forty inches ; tail about 
thirty inches. 
Habitat.—Eastern and South-eastern, perhaps extending its 
range to Northern Australia. 
References.—Thomas, B.M. Catal. p. 20. 
Subclass ITI.—_KUTHERIA. 
The Eutherian Mammals are, as their name implies, by far 
more specialized than either of the preceding Subclasses. The 
name here adopted was bestowed upon them by Prof. Huxley in 
exchange for the older terms MonopELPHIA (one wombed) and 
PLACENTALIA, in order to keep the nomenclature of the three 
Subclasses as uniform as possible, and in view of the fact that 
equivalent names for the remaining Subclasses, namely, DIDELPHIA 
(two wombed) for the Marsupials, and OrnirHoDELPHIA (bird- 
wombed) for the Monotremes were manifestly incorrect and 
therefore misleading. They differ from other Mammals in that 
the foetus is nourished for a considerable, but varying length of 
time within the uterus of the mother, and when brought forth is 
in such an advanced stage of growth as to be able of its own 
volition to draw nourishment from the teat, without the inter- 
vention of muscles specially adapted for forcing the milk into 
its mouth, as in the Marsupials. 
In their mode of life the Eutherian Mammals show a great 
divergence, much more so than the Metatherian Mammals do, 
some, for instance, as the Srrenta (Dugong, &c.), and especially 
the Creracea ( Whales, Dolphins, &c.) being fitted for a purely 
aquatic life; others like the Prynipepia (Seals and Walruses) for 
a mixed aquatic and terrestrial existence, the former predomin- 
ating; others again like the Cutroprrra (Bats, and Flying-foxes ) 
for an aérial existence ; while the habits, food, &c of the purely 
terrestrial forms are diverse in the extreme, and necessitate many 
and startling changes in their form, structure, dentition, organs 
of digestion &e. 
In order to meet these diverse conditions of existence it became 
necessary to divide this large and complex Subclass into various 
sections, technically known as “ Orders,” of which scientists now 
recognise ten, as at the present time existent on our planet, these 
being classified as follows :—(i.) Epentata, the Sloths, Armadillos 
