Mammals from the Johore Arcldjtelago. 591 



muzzle, and from A. m. zygomaticus '^ , of Aor, by tlie large 

 size of the laclirymal and by the absence of the tooth-like 

 process on the under side of the malar. 



Colour. — Somewhat darker than either A. m. macrourus 

 or A. m. tt'oni's, closely resembling A. m. zygomaiicus. 



Skull. — Quite distinct from that of its nearest geographical 

 neighbour, A. m. zygomaiicus, in that the lachrymal is dis- 

 tinctly visible when the skull is viewed from above, the* 

 zygomatic arch much narroirer, and the tooth-like process 

 of the malar not even indicated. Intertemporal constriction 

 less marked tiian in the mainland form, the nazals sliorter 

 than in that from Tionian, the muzzle being also deeper and 

 the posterior portion of the frontals more inflated. Fronto- 

 premaxillary suture in advance of the posterior termination 

 of the nasals and not in line with it as in the two related 

 forms. 



Measurements. — Collectors' external measurements of type 

 (taken in the flesh) : — 



Head and body 456 (516 f) mm.; tail — (176) ; hind 

 foot 64(60) ; ear 35 (34). 



Cranial measurements : upper length 89 (91) ; condylo- 

 basilar length 75 (77) ; greatest breadth 45 (48) ; nasals 

 24-5x13 (27x15); intertemporal breadth 24'3 (26); 

 height of muzzle on diastema 20*8 (18'5); height of crown 

 above palate 24'2 (25) ; palatilar length 35 (39) ; diastema 

 23*2 (28) ; lengtli of upper tooth-row (crowns) 16'3 

 (16-8). 



The dimensions of an adult male are: — 

 Head and body 490 (586 \) mm. ; tail 180 (304) ; hind 

 foot 64 (73) ; ear 36 (38). 



Crania! measurements : upper length 89*5 (102) ; condylo- 

 basilar length — (94) ; greatest breadtli — (51) ; nasals 

 24-5 X 14-5 (26-9x15); intertemporal breadth — (27); 

 height of muzzle on diastema 21 (22) ; height of crown 

 above palate — (27'8) ; palatilar length — (43*5) ; diastema 

 28"5 (31'8) ; length of upper tootii-row (crowns) 16"1 

 (17-0). 



Specimens examined. — Four, all from the type locality. 

 Remarks. — Exceedingly abundant among the rocks on the 



* Miller, Smithsonian Misc. Ooll. 45, p. 42, pi. ii. fig. 4 (1903) ; Lyon, 

 Proc. U.S. Nat. Mus. xxxii. pp. 587, 588, 593 (1907). 



t Measurements in parentheses those of the type of Atherurus 

 tionis. 



X Measurements in parentheses those of an adult male Atherurus 

 maa-ourus from Sungei Siput, Central Perak, Selangor Museum, 

 No. 966/11. 



4.0-^ 



