246 Mr. O. Thomas on 
Dimensions of the type (measured by the collector) :— 
Head and body 187 mm.; tail 235; hind foot 43. 
Skull: back of nasals to occiput 30; condyle to front of 
molars 28; interorbital breadth 6°2 ; breadth of brain-case 18 ; 
zygomatic. plate 4; postforaminal palate 7°9; upper molar 
series 84. 
Hab. 5S. Celebes. Type from Indrulaman, Mount Bon- 
thain, 2000’. 
Type. Adult male. B.M. no. 97.1.3.10. Original num- 
ber 28. Collected 12th October, 1895, by A. H. Everett. 
One specimen only. 
Distinguishable by its comparatively small size, long 
palatal foramina, and the relatively short white end to the 
tail. 
It is not improbable that this species is Revilliod’s Mus 
(Epimys) xanthurus orientalis *, but, in any case, the name 
orentalis is invalidated by its previous use for an African 
Mus by Cretzschmar, 
Rattus marmosurus, sp. n. 
With very long fur, which encroaches on the base of the 
tail; piles long, but not excessively elongated. 
Size decidedly smaller than in 2. wanthurus. Fur soft, 
spineless, aid very long, especially posteriorly on the rump 
and base of tail, the ordinary hairs 25-30 mm. in length, the 
longer piles surpassing them by 8-10 mm.; the base of the 
tail as hairy as in Lenomys meyeri. General colour above 
near cinnamon-brown, the hairs coarsely ringed with black 
and dull rufous. Under surface greyish white, the hairs 
white to the base along the middle line, but laterally many 
hairs are slaty-based. Hands and feet brown above, whiter 
on the digits. Tail coarsely ringed, thinly hairy, blackish 
for its basal third, then white. 
Skull lightly built, supraorbital ridges neither heavy nor 
far extended. Nasals abruptly narrowed about their middle, 
not pointed behind. Zygomatic plate not projected forward, 
about as in R. wanthurus. Palatal foramina large and well 
open, their hinder edge level with the front of m’. Bulle of 
medium size, smaller than in wanthurus. 
Incisors comparatively orthodont, the angle about 75°. 
Molars light and delicate. 
Dimensions of the type :— 
Head and body 230 mm.; tail 260 ; hind foot 36; ear 21. 
Skull: greatest length 45; condylo-incisive length 42°7 ; 
* Zool, Anz, xxxvii. p. 613 (1911). 
