REVISION OF AUSTRALIAN JERBOA MICE. 
Family MURID AE Grey 1821. 
Subfamily Murinae Baird 1857. 
Genus NOTOM YS Lesson. 
Notomys, Less., N. Tabl. R. A. Marnm., p. 129, 1842; Thomas, Ann. 
Mag. Nat. Hist. (7), XVII, p. 83, 1906. 
Thylacomys, Waite, Proc. Roy. Soc. Viet., X, p. 121, 1898 (nee Blythe, 
1841). 
Ascopharynx, Waite, Ann. Mag. Nat. Hist. (7), V, p. 223, 1900 ; Wood 
Jones, Rec. Sth. Aust. Mus., Ill, p. 1, 1925. 
General characters murine. Teeth practically as in Mus, no posterior internal 
cusp on molars. Skull with anterior edge of zygoma root deeply concave. 
Hind feet lengthened, pads reduced to three or four. Tail long ; basal half 
with short hairs, not clothed sufficiently to hide scales, distal half with gradually 
lengthening hairs toward the pencilled tip. Gland on throat sharply defined 
by solid, silvery hair, quite distinct from the normal hair. 
Genotype . . . N. mitchelli Og. 
Notomys gouldi (Gould) . 
Hapalotis gouldi, Gray, Grey's Journal, II, Append., p. 404, 1841 (nomen 
nudum) ; List Mamm. Brit. Mus., p. 116, 1843 (nom. nud.). 
Hapalotis mitchelli, Gould, Mamm. Aust. Ill, pi- IX, 1845, W. Aust., nec 
Dipus mitchelli, Ogil. 
Hapalotis gouldi , Gould, Pro. Zoo- Soc., 1851, p. 127 (nom. nud.) ; Mamm. 
Aust., Ill, Introd., p. XXXV, 1863. 
Hapalotis richardsoni, Gray, Voy. “Erebus” and "Terror,” Mamm., p. 12d, 
pi. XXVIII, fig. 2, 1875. 
Notomys gouldi, Thomas, Pro. Zoo. Soc., 1906, p. 767 ; Ann. Mag. Nat. 
Hist. (9), VIII, p. 538, 1921. 
Large, comparatively thinly haired. General colour between buffy- and 
olive-brown. Dorsal fur (11.5 mm.), slate for three-fourths of length, then 
cinnamon buff with dark tips, slate of base showing through and imparting a 
cool tone. Sides of body lighter, dark tips being less pronounced. Cheeks 
lighter, upper lip almost white. Ear long and oval in outline ; outer surface 
sparsely clothed with short, fine, brown hairs, inner surface with silvery 
adpressed hairs, most numerous round edges. Chin and throat clothed with 
silky, silvery hair, white to base in sharp contrast with remainder of ventral 
fur. Ventral surface of body greyish white, hairs basally grey with white tips, 
the grey showing through. Tail brown above, white below ; extreme tip 
uniformly clothed with dark hairs (15 mm.). Manus and pes sparsely covered 
with silvery hairs, which form fringe round distal pads. Pes slender (4.5 mm. 
at base of toes 2.3.4.), hallux small. Four pads ; hallucal distinctly raised in 
8 specimens, less so in remainder. 
Skull. — For size of animal, small and slender in build, with narrow muzzle 
and small bullae (ant. -post, length two-thirds of diastema). 
Teeth. — Index of incisors 50°-58°. 
Habitat.— West Australia. 
Type . — In British Museum. 
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