Celebes, Borneo, and the Philippines. 249 



length from henselion 19-6; palatal foramina 6-7 x 2-1; 

 length of upper molar series iJ'Q ; breadth of palate outride 

 ^^ 8, inside ^li 4-2. 



Hah. Bonthain Peak, S. Celebes, 6000 feet. 



Coll. A. H. Everett, October 1895. 



This remarkable species differs so much in its external 

 characters from ordinary rats tiiat I have had great doubts 

 whether a special genus or subgenus ought not to be made 

 for its reception. As, however, there do not seem to be any 

 very definite cranial or dental characters, I feel justified in 

 leaving it for the present in the genus Mas. 



Size medium, about halfway between rat and mouse. Fur 

 thickly spinous. General colour greyish brown, finely 

 speckled with rufous. Belly white, the bases of the hairs 

 grey ; line of demarcation on sides well defined. Ears 

 almost naked, laid forward in a spirit-specimen they reach to 

 the middle of the eye. Palate-ridges as usual in the group, 

 i. e. as figured by Jentink in Mus Wichmanni'^. Mammas 

 2 — 2 = 8. Hands and feet pure white above; fifth liind toe 

 reaching nearly to the end of the basal phalanx of the fourth ; 

 soles naked, with only 5 pads, the ordinary postero-external 

 pad either suppressed or coalesced with that at the base of 

 the fifth toe. Tail long, thinly haired, not pencilled ; its 

 scales large (10 to the centimetre), uniformly brown above 

 and below, but the hairs below are white, although they do 

 not hide the brown colour of the scales. 



Skull narrow, with the zygomata little expanded. Inter- 

 orbital space broad, its edges strongly rimmed, the raised 

 ridges running backwards to the hinder edges of the parietals. 

 Interparietal large. Anterior edge of the zygoma-root well 

 projected forwards. Anterior palatine foramina reaching 

 backwards just to the level of the front of ^. Teeth rather 

 small in proportion to the size of the skull. 



Dimensions of the type (an adult male in spirit) : — 



Head and body 134 millim. ; tail 172; hind foot 30; 

 ear 17. 



Skull : basal length 30'2; basilar length from henselion 28; 

 greatest breadth 16'5; nasals 12*8 x3"9; interorbital breadtli 

 5'6, interparietal 53x10; zygoma-root 3*5; diastema 9*7 ; 



* Weber's Zool. Ergebn. Niederl. Ost-Indien, Mamm. p. 120, pi. x. 

 fig. 7 (1890). 



Ann. dc Mag. N. Hist. Ser. 6. Vol. xviii. 1 7 



