1/2 DR. F. A. JENTINK. MAMMALS. 



397 — 4Ç3 — 4Ç5_ 446 — 448 — 449 



head and body ...... 210 — 310 — 309 — 245 — 295 — 305 



tail 165 — 257 — 245 — 235 — 238 — 223 (inc.) 



hindfoot 50 — 60 — 56 — 55 — 53 — 54 



ear 25 — 25 — 26 — 22 — 23 — ■ 24 



skull: basai Iength 41 — 57 — 59 — 50 — 54 ■ — 54.5 



zygomatic breadth ... 24 — 32 — 34 — incompl. — 29.5 — 32 



diastema 13 — 19.5 — 20 — ■ 16.5 — 17 — 18.5 



upper molar séries ... 11 — 11 — 11 — 11 — 11 — 11 



456 — 570 — 47 1 



head and body 285 — 300 — 295 



tail 225 — 235 — 260 



hindfoot 56 — 57 — 55 



ear . . . , 24 — 23 — 24 



skull: basai Iength. ... 53 — 58 — 57 



zygomatic breadth . 31 — 34 — 33 



diastema 17.5 — 20 — 19.5 



upper molar séries . 11 — 11 — 11 



The localities are the following: 



N°. 397. Young adult Q. Bivak Island, January 1. 1910 (skin with skeleton). 

 N°. 403. Very old rf. Bivak Island, January 6. 1910 (skin with skeleton).. 

 N°. 405. Very old 9- Bivak Island. January 8. 1910 (skin with skeleton). 

 N°. 446. Old cf. Alkmaar, February 2. 1910 (skin with skeleton). 

 N°. 448. Very old Q. Rivier Camp, February 6. 1910 (skin with skeleton). 

 N°. 449. Very old Q. Rivier Camp, February 8. 1910 (skin with skeleton). 

 N°. 456. Very old cf. Rivier Camp, February n. 1910 (skin with skeleton). 

 N°. 470. Very old çj '. Bivak Island, February 9. 1910 (skin with skeleton). 

 N°. 471. Very old Q. Bivak Island, Februari 12. 1910 (skin with skeleton). 



They agrée exactly with the young type-specimen in distribution of dark and white, 

 in shape of ear, texture of tail a. s. o. and in having the so typical numerous palate-ridges. 



Mammae : o — 2 = 4. Upper incisors of a beautiful mahogany, lower ones yellower. 



Skeleton with 13 thoracic, 7 lumbar, 3 sacral and 34 caudal vertebrae. N°. 470 has 

 the seventh lumbar vertebra with rudiments of ribs (vide PI. VII fig./); mesosternum with four 

 segments; xiphisternum spatula-shaped nearly as long as the three adjoined segments of 

 mesosternum. 



Among the collection of lower-jaws, mentioned above, there are eight apparently 

 belonging to spécimens much alike Pogonomys multiplicatus ; in our skulls of multiplicatus the 

 molar-series shows a remarkable constancy in size; from the fact that thèse eight Pesegem- 

 lower jaws hâve the molar séries larger than in multiplicatus we may conclude, that the 

 animal itself must be a différent hitherto unknown mammal; lower molar séries of multi- 

 plicatus = 12 mm., lower molar séries of the unknown animal = 13.5 mm. 



