DR. F. A. JENTINK. MAMMALS. 367 



fourth and fifth ones show an- in the middle broken line ; the sixth ridge is curved and 

 crenated. 



Some measurements of the skull : 



occiput to anterior margin of nasalia .... 34 



distance between eyeholes 5.5 



canthus to anterior margin of nasalia . . . .12 



upper molar-series 7.5 



diastema 9.5 



10. Pogonomys multiplicatus n. sp. 

 , Plate 16. 

 A single young maie in alcohol, procured on the Sentani Lake, April 18. 1903, Hum- 

 boldt Bay expédition. 



Measurements taken from the spécimen in the flesh, in millimeters : 



head and body 185 



tail 165 



hind foot 46 



ear 19.5 



Fur very soft to the touch; hairs on upperparts and sides of the body mouse-color, 

 yellowish brown tipped; on the back there are numerous longer hairs of a glistering black 

 throughout, spread among the other hairs, giving the back a darker hue ; middle of head like 

 back, for the rest colored like the sides of the belly; chin, breast and belly of a pure white; 

 hands and feet sooty-colored. Whiskers numerous and very long. Ears broadly rounded off. 

 Tail with rings of not overlapping scales ; each scale with a single hair, so that the tail looks 

 quite bald; thèse scales are of a brownish black color; towards the end of the tail the scales 

 are absent presenting merely their pattern; the top of the tail is without pattern, bald. Hands 

 with four well clawed fingers, the fifth small with a blunt nail; feet with five well clawed toes. 

 Incisors yellow; molars 3 / 3 (fig. 6), the third one in each jaw is almost invisible in alcohol, 

 so that the first impression was 2 / 2 molars ; molars very large and stout, especially compared 

 with those of the other Pogonomys-species, the two upper-ones measure 9.5 mm. against f. i. 

 in sexplicatus with the three molars measuring 7.5 mM. ; therefore multiplicatus when full- 

 grown certainly will attain the size of a large rat, much larger than any other hitherto des- 

 cribed Pogono}nys-species. 



More striking still than its size and peculiar color is in our animal the very uncommon 

 number of palate-ridges, really multiplicatus, besides the shape of thèse ridges ; there are three 

 anterior ridges as usual, the first in the form of a beautiful trifolium, rather quinquefolium, 

 broadly based, the second is a straight ridge somewhat impressed in the middle, meanwhile 

 the third one is slightly curved; thèse three ridges are connected by a slender raised bridge; 

 this slender raised bridge continues in the middle of the palate to its end, perpendicular upon 

 the last ridge which is a straight one, Connecting the posterior margin of the molar-alveoli ; 

 from this middle bridge runs a number of twelve fiattened ridges to the molars, the anterior 

 ones broad, diminishing in breadth towards the posterior end of the palate, in such a man- 



