337 



125 — 



474 

 140 - 



499 

 - i 5 8 



134 — 



i 4 5 - 



- 140 



26 — 



27 - 



- 30 



12.5 — 



12 - 



- 15 



DR. F. A. JENTINK. MAMMALS. \f\ 



Pogonomys sexplicatus Jentink. 



Nova Guinea, Vol. V, Zoologie, p. 366 (November 1907). 



N°. 337. Adult Ç>. Alkmaar, November 1909 (skin with skeleton). 



N°. 474. Adult Q. Near Bivak Island, February 19. 1910 (skin with skeleton). 



N°. 499. Old Ç. Near Bivak Island, March 9. 1910 (skin with skeleton). 



Some measurements taken in the flesh, in millimeters : 



head and body 

 tail. ...... 



hindfoot 



ear ....... 



Mammae : o — 2 = 4. 

 I see no describable différence between thèse individuals and the type-specimen from 

 the Sentani Lake, Humboldt Bay. The skeleton présents i3_thoracic, 7 lumbar, 4 sacral and 

 34 caudal vertebrae ; the animal from Alkmaar however has one lumbar vertebra less and 

 one thoracic more, the latter with very well developed ribs, although not implanted like 

 the other ribs (cf. Plate VII, fig. e), indeed a very great exception among the 20 skeletons of 

 Pogonomys before me. There are four mesosternal segments, the fourth however more or less 

 conspicuous. 



Pogonomys multiplicatus Jentink. 



Nova Guinea, Vol. V, Zoologie, p. 367 (November 1907). 

 A very young cf. Lorentz River, March 16. 1910 (skin with skull). 



The animal is still much smaller than the young spécimen mentioned by me in „Nova 

 Guinea, Vol. IX, Zoologie, p. 8", as procured at Van Weel's Camp; that the Lorentz River- 

 specimen belongs with the latter to the same species is without doubt; another question is 

 however whether thèse two spécimens truly belong to the same species as that, the type- 

 specimen of which came from the Sentani Lake, Humboldt Bay. This is somewhat uncertain. 

 Although I observed, studying the young Van Weel's Camp-animal, that the incisors are 

 pure white and those of the upper jaw slightly curved outward, I thought it not necessary 

 to put this observation down in my description, suggesting that it was so because of the extrême 

 youth of the individual; I think it correct to state now that I find the same white incisors 

 and the same outward curved upper incisors in the still younger Lorentz-river-specimen ; 

 herein they differ from the young type-skull from Sentani Lake, which has yellowish 

 mahogany coloured incisors. Until adult spécimens corne at hand it is not possible to unravel 

 this puzzle. Preyiously I think it correct to retain the name multiplicatus for thèse three spécimens. 



In the description of the type-specimen (p. 367) I suggested that: ^multiplicatus 

 when fullgrown certainly will attain the size of a large rat, much larger than any other 

 hitherto described Pogonomys-s-ptcxes" , and several spécimens in the Lorentz-collection now prove 

 that I was quite right, as may be seen from the following list of measurements ; the animais 

 indeed are of a very large size, but happily not ail of the same âge. 



