_Antechinomys_ has thirteen dorsal and seven lumbar vertebrae; three sacrals and twenty-five caudals, the latter number being in excess of that of its allies. The stomach is nearly globular, with approximated orifices; the intestine measured 6.8 inches, a little more than twice the length of the animal itself. _A. lanigera_ is a native of East Central Australia, and appears to be entirely terrestrial in habit, and to progress by a series of leaps--at any rate when going at full speed. Professor Spencer, who found examples of this rare species, gives {154} an interesting description of its habits. _Antechinomys_ has much the look of the Australian Rat, _Hapalotis mitchelli_; and as the two animals lead a similar kind of life, the resemblance is not unexpected. Professor Spencer wonders why these creatures are saltatory in habit. The country which they inhabit is arid, but with patches of grass and shrubs. For a big kangaroo the advantage of the power of leaping over such obstacles may be obvious, but not for the small and slender _Antechinomys_. The chief foes of this rare Marsupial appear to be predatory birds; and Professor Spencer thinks that the saltatory mode of progression may be more baffling to such pursuers than even a rapid run. The genus _Dasyuroides_ has been lately instituted by Professor Spencer for a Marsupial from Central Australia somewhat intermediate between _Sminthopsis_ and _Phascologale_. As there is but one species, the generic will be considered with the specific characters. _D. byrnei_ is an animal of about the size of the Common Rat. The hallux is absent. The tail is fairly thick, but not "incrassated." There are six mammae, and the pouch is but slightly developed, with two low lateral folds. The dentition is I 4/3 C 1/1 Pm 3/2 M 4/4. This Marsupial is nocturnal, and burrowing in habit. Its food consists of insects.[93]