392 MR. OLDFIELD THOMAS ON MAMMALS 



Skull (PI. XXXV. fig. 9) in general form not unlike that of Celcenomys, but even 

 more wedge-shaped owing to its greater height posteriorly. Nasals short, their anterior 

 end level with the middle of the incisive fissure. Interorbital region similarly rounded 

 and unridged. Brain-case broader and shorter, so that its breadth is equal to its 

 length. Interparietal very small, a mere narrow transverse slip. Anterior edge of 

 zygoma-plate slightly concave, the plate little developed. Incisive fissure large, quite 

 half as large as one of the palatal foramina, which are. as usual in this group, very 

 small. Posterior nares large and open, the hinder edge of the palate level with the 

 posterior lamina of to. 2 . Pterygoids large, pi'ojecting downward considerably below 

 the level either of the molars or bullae. Lower jaw as in Celcenomys. 



Teeth. Incisors pale yellow, thrown forward, simple, rounded in front. Molars f 

 (PL XXXV. fig. 8), the anterior two very similar in structure to those of Xeromys 

 (figured P. Z. S. 1889, pi. xxix. fig. 10), but to. 1 has its middle lamina simpler (more as 

 in Hydromys) and its posterior lamina is almost obsolete, while m. 2 has its posterior 

 supplementary cusp more definitely postero-external, the difference in position being- 

 no doubt due to the presence of the additional molar behind. M. 3 quite small, 

 transversely or obliquely oval in section. In size m. 2 and m. 3 together are barely two 

 thirds the length of to. 1 . 



Below, TO.J is of the most ultra-h)dromyine character, without any of the suppressed 

 cuspidation of the anterior margin found in Xeromys, and even without the supple- 

 mentary postero-external cusp found in both the Australian genera. Jf. 2 asin Xeromys. 

 M, 3 nearly circular, about one-sixth the size of m, 2 , slightly larger than to. 3 . 



Chrotomts whiteheadi Thos. (Plate XXXII.) 

 a-d. Monte Data, Lepanto, 8000 feet, Feb. 1895. 



Size of Mus rattus. Fur soft and thick, but not specially long. General colour 

 greyish brown, tending in some specimens to rufous; a well-defined buff or orange 

 line extending from between the eyes down the back nearly to the tail, shown up on 

 each side by a broad shining black band. Under surface dull slaty buff, not sharply 

 defined on the sides. Top of muzzle dark brown, continuous with the dark edgings 

 to the central yellow band. Ears of medium length, fairly covered with minute hairs, 

 uniformly blackish brown. Metapodials shining grey, digits nearly naked, whitish. 

 Tail short, slender, about half the length of the head and body, thinly hairy, brownish 

 black above, rather paler below, extreme tip whitish. 



Skull and teeth as already described. 



Dimensions of the t5pe, an adult male, measured in skin : — 



Head and body 196 millim. ; tail 111; hind foot (moistened) 35. 



Dimensions of skull, see p. 395. 



Type. B.M. 95. 8. 2. 19. 



