120 CONILURUS. 
References.—Ogilby, Proc. Linn. Soc. 1838, xviii. p. 1380 ; 
Gould, Mamm. Austr. iu. pl. ix. 
Type.—In the Australian Museum. 
Note.—Gould remarks that this species differs from the pre- 
ceding in preferring sandy districts, frequenting the sides of 
grassy hills tolerably well clothed with small trees growing in a 
light soil, in which it forms its burrow. 
13. ConiLurus cERVINUS, Gould, sp. (1851). 
Fawn-colored Jerboa-Rat. 
Ears very large, pointed, and nearly naked ; tail longer than 
the head and body. General color above delicate fawn inter- 
mixed with numerous fine black hairs; nose and under surfaces 
white ; tail pale brown above, lighter below. 
Dimensions.—Head and body up to four and a half inches ; 
tail to five and a half inches. 
Habitat.—Interior of South Australia. 
Reference.—Gould, Mamm. Austr. iii. pl. x. 
Genus V.—MASTACOMYS, Thomas (1882). 
Similar to Mus, but with the molars remarkably broadened 
and the mammez reduced in number to four. 
1. Masracomys Fuscus, Z’homas (1882). 
Broad-toothed Rat. 
Ears rather large ; tail shorter than the head and body; fur 
extremely long and soft. General color both above and below 
dark grayish-brown ; tail and upper side of feet clothed with dark 
brown hairs, those on the former not lighter below. Sole-pads 
five on the fore and six on the hind feet. Molars remarkably 
broad and heavy, the anterior ones each more than half as broad 
again as the palatal space between them ; middle lamina of the 
first molar and anterior lamina of the second with three cusps ; 
the additional ones external and very small. 
Dimensions.—Head and body up to five and three-fifths inches ; 
tail to three and three-fourths inches. 
Habitat. —Tasmania. 
Reference.—Thomas, Ann. Nat. Hist. (5) ix. p. 413, figs. 1 
(inner view of upper jaw, &c.), 2 (molars), and 3 (front edge of 
anterior zygoma-root ). 
Note.—Fossil remains of this Rat have been obtained from the 
Wellington Caves, New South Wales. 
