FROM THE PHILIPPINE ISLANDS. 409 



Palatal foramina long. Outer and inner pterygoids well developed. Bulla? very small, 

 though more inflated than in Phlceomys. 



Incisors not large in proportion to the size of the animal, flat in front. Molars 

 (PI. XXXVI. fig. 2) large and heavy, separated in the middle line by a distance less 

 than their breadth; rather hypsodont, though less so than in Batomys; their pattern, 

 while in the number of laminae and cusps essentially as in Mus, yet peculiar on account 

 of the diminution or suppression of the external and the great development of the 

 internal cusp of each lamina. On this account the longitudinal groove between the 

 inner and middle cusps, in which the inner cusp-row of the lower molars works, 

 approaches the centre of the tooth-row, instead of being close to its inner edge. As 

 an accompaniment to this development of the inner cusp of each lamina, the point 

 of separation between it and the centre cusp is marked by a sharp and deep infolding 

 of the anterior enamel wall of the lamina ; this notch is so deep in many cases as 

 almost to cut the lamina in two. Below, the two halves of each lamina are strongly 

 bent backward, so as to form a sharp angle with each other in the middle line. 

 M . L and m. 2 with well-developed supplementary posterior cusps ; ?ft. 3 with its posterior 

 lamina sharply notched in behind, so as to give it a very definite cordate shape. 



Altogether the molars have a general resemblance to those of the remarkable Mus 

 meyeri, Jentink, an animal which (as may be seen from the footnote x ) I think should 

 also form a peculiar genus. 



Crateromys schadem3ergi (Mey.). (Plate XXXVI. fig. 2.) 

 PhlcBomys (?) schadenbergi Mey. Abh. Mus. Dresd. 1894-5, no. 6 (1895). 

 Crateromys schadenbergi id. op. cit. 1896-7, no. 6, p. 32, pi. xiii. figs. 3-6 (skull), xiv. (animal) (1896). 



a-c. Monte Data, Feb. 1895. 



This fine animal was first discovered by Dr. Schadenberg, but it is to Mr. Whitehead 

 that our chief knowledge of it is due, as the former's specimen was only a skin without 



1 Lenomts g. II. 



Form Rat-like. Feet short and broad ; pollex forming a large rounded projection of the hand, on the top of 

 -which the small nail is placed ; hallux short, not opposable, its terminal pad large, covering nearly the whole 

 of its under surface, its claw shorter, blunter, and more curved downward than those of the other digits ; 

 palmar and plantar pads all very large. 



Molars (PI. XXXVI. fig. 1) very large, the space between them less than their breadth. All three 

 cusps of each lamina very strongly defined, the points of junction on each side of the central cusp marked 

 anteriorly by a notch, and posteriorly by a backward projection of the enamel. M. 2 and to. 3 have, besides the 

 usual antero-internal supplementary cusp, another one to balance it antero-externally, while the latter tooth 

 has also a mesial supplementary cusp posteriorly. Lower molars very like those of Crateromys, but m. has 

 two, and m. 2 has one supplementary external cusp. These characters may be seen in the figures of the skull 

 quoted below and in that of the teeth on PI. XXXVI. 



Type. Mus meyeri, Jent, X. L. M. i. p. 12 (1878); Cat, Ost. Leyd. Mus. (M. P.-B. ix.) p. 211, pi. vii. 

 figs. 5-8 (1887) ; Hoffmann, Abh. Mus. Dresd. 1S87, no. 3, fig. 2. 



vol. xiv. — part vi. No. 5. — June, 1898. 3 h 



