FROM THE PHILIPPINE ISLANDS. 405 



Batomys Thos. 

 Batomys Thos. Ann. Mag. N. H. (6) xvi. p. 16.2 (1895). 



General external form very much as in Carponiys, but witli a shorter, though 

 similarly hairy, tail. Eyes sun-ounded by a distinct naked, or at least very finely 

 haired, rin;?, a peculiarity which forms one of the readiest means of distinguishing 

 Batomys from Carponiys externally. Fore feet rather elongated ; poUex with a nail. 

 Hind feet broad ; sole-pads as usual six in number, but all very large, and both the 

 fourth (hallucal) and fifth (usually small and rounded) elongated like the sixth ; pads 

 not striated. Whole of heel hairy to the level of the hinder end of the last sole-pad. 

 Fifth hind toe reaching to the base of the third phalanx of the fourth ; hallux just to 

 the base of the second toe. 



Skull (PI. XXXVI. fig. 8) more elongate and murine than that of Carpoinys, in 

 general outline not unlike that of Eliomys g;uercinus. Brain-case small, face compara- 

 tively long. Interorbilal space rather narrow, its edges with only the slightest 

 indication of ridges. Interparietal fairly large. Anterior edge of zygoma-root not 

 projected forwards. Anterior palatine foramina large. Bullae small. 



Incisors narrow, smooth in front. Molars (PI. XXXVI. fig. .5) in their pattern like 

 those of Mus, not of Carpomys, but instead of being distinctly brachyodont, as are 

 those of nearly all other Murines, they are more or less hypsodont, the crown at least 

 as high above the bifurcation of the roots as it is broad. Molar lamina?, as in Mas, 

 3 — 2 — 2; transverse, not oblique; m.^ and m.'^ with well-defined antero-internal 

 supplementary cusps. M.^ and ??!., also with distinct posterior mesial supplementary 

 cusps. 



This genus, although with a striking external resemblance to Carpomys, is really 

 more nearly allied to Mtis, as its elongate skull and the pattern of its molars indicate. 

 Its curious bare eyelids and hypsodont molars are, however, characters in which it is 

 different from all the other Eastern arboreal genera. 



Batomys geanti Thos. (Plate XXXIII. fig. 2.) 

 Batomys granti Thos. t. c. p. 162. 



a-c. 2 adult and 1 immature. Monte Data, Feb. 1895. 



Size of a large Rat. Fur thick, close, and rather coarse. General colour coarsely 

 grizzled fulvous and black all over above, the face, however, more greyish ; posterior 

 back and rump tending more towards rufous. Ears of medium length, more thinly 

 haired than in Carpomys, their backs black or dark brown. Under surface dirty buff, 

 not sharply defined ; the bases of the hairs slate-colour throughout, though an 

 indistinct whitish mesial line is sometimes present. Metacarpals and metatarsals 

 brownish mesially, whitish laterally and on the digits. Tail thickly and uniformly 



