having the ears smaller, and clotlied internally with dusky hairs in- 

 stead of white ; the incisor teeth rather broader ; the tarsi smaller ; 

 the fore-feet much smaller ; the tail more sparingly clothed -vv'ith 

 hairs, which are of a less pure \vhite on the under side, and the darker 

 hairs of the upper surface extending somewhat on to the sides of 

 the tail, and in not presenting that strongly-marked line of separa- 

 tion betvveen the colouring of the upper and under surface. The fur 

 is rather less soft, less tinted with yellow on the upper parts, and 

 more so on the sides of the body. 



Mus ALBOCINEREUS. M. vellere longo permolli, pallide cinereo, in 

 dorsum pallide fusco tincto ; corpore subtus, caiidd, pedibusgue 

 albis ; caudd supra indistincte nigro penicillatd ; auribus medio- 

 cribus pilis albescentibus vestitis. 



unc. lin. 

 Longitudo ab apice rostri ad caudae basin. ... 3 9 



caudfB 3 6 



ab apice rostri ad basin auris .... 1 \\ 



auris O 5^ 



tarsi digitorumque O 10 



Hab. Moore's River, in the interior of Western Australia. 

 This mouse is rather larger than the Mus musculus, and consider- 

 ably stouter in proportion ; has the head large, the ears moderate ; 

 the tail nearly equal to the head and body in length ; the tarsi very 

 slender ; the fur very long and soft, and its general hue pale ashy 

 grey ; on the hinder part of the back a slight brownish tint, produced 

 by a very fine and indistinct pencilling of dusky or pale greyish yel- 

 low ; the lower part of the sides of the body and the whole of the 

 under parts white, but not quite pure, having a faint greyish hue ; the 

 head grey-w'hite, pencilled with black ; the sides of the muzzle w-hite ; 

 the ears Avell-clothed with minute greyish white hairs ; the feet white, 

 and if we except some scattered blackish hairs on the upper surface, 

 the tail also vvhite. 



Hapalotis murinus. Hap. vellere permolli, corpore supra pallide 

 flavo, nigrogue penicillato, lateribus corporis flavis ; guld abdomi- 

 nis, caudd, pcdibusque albis ; caudd suprd, indistincte nigro peni- 

 cillatd ; auribus mag?iis, subovatis, pilis minutis albis vestitis. 



unc. lin. 



Longitudo ab apice rostri ad caudae basin. ... 5 6 

 caudcc 3 9 



ab apice rostri ad basin auris .... 1 3 



auris O 10 



tarsi digitorumąue 1 Oj 



Hab. Plains near the Namoi, New South Wales. 

 This animal is remarkable for the extreme softness and delicate 

 colouring of its fur, -vvhich on both the upper and under parts of the 

 body is of a slate-grey tint next the skin, but on the under parts of a 

 pure white colour externally, except on the mesial line of the abdo- 

 men, where there is a slight yellow tint ; on the upper parts and 

 sides of the body the exposed portions of the hairs are of a delicate 



