214 PHASCOIOMTID^. 



Phascolomys angasi and setosus, Crray, Ann. Mag. N. H. (3) xi. 



pp. 458 & 469 (1863). 

 Phaacolomys setosus, McCoy, Tr. Roy. Soc. Victoria, viii. p. 270, 



fig. D (nasals) (1868). 

 Phascolomys assimilis, Kreffi, P. Z. S. 1872, p. 796. 



Common ArrsiEAiiAiir Wombai. 



Size largest of tie genus. Rhinarium large, quite naked, more 

 or less pentagonal in shape, its edges sharply defined from the hairy 

 parts of the muzzle. Fur fairly long, but coarse, harsh, and hispid ; 

 underfur almost or entirely absent. Colour all over either yellow, 

 grizzled yellow and black, or black, the colour in each case quite 

 uniformly distributed all oyer the head, body, and limbs ; no special 

 markings anywhere. Ears short, rounded, well-haired. 



SJcull large and powerful. Muzzle broad, its sides laterally 

 expanded ; infraorbital foramen narrow, slit-like. Nasals large, 

 expanded behind, their greatest breadth about three fourths of 

 their length, their posterior margins bowed backwards in the 

 centre ; naso-premaxillary three or four times as long as naso- 

 maxillary suture. Interorbital region smooth, evenly convex, its 

 edges sharp, well-defined, and continued backwards as distinct 

 temporal ridges to the occiput ; postorbital processes rudimentary, 

 the distance between their tips not exceeding the interorbital 

 breadth by more than from 4 to 6 miUim. Anterior palatine 

 foramina long, fairly well defined behind, the palate not markedly 

 concave round them, except slightly anteriorly. Posterior palatine 

 vacuities triangular, about equal in size to one of the molars. 



Eibs, both in this species and the next, 15 in number; these 

 being, with the exception of the 11 found in the Koala, the only 

 instances in which the usual Marsupial number of 13 is departed from. 



Teeth. Upper incisors comparatively narrow, deep antero-pos- 

 teriorly, their anterior surfaces nearly or quite smooth, with scarcely 

 any trace of grooves. Lower incisors rounded in section, about as 

 broad as deep. Molars as usual. 



Dimensions. 



g (Btuffed). 

 millim. 



Head and body 1100 



Hind foot 100 



Ear 45 



SkuU, see p. 219. 



Hah. New South Wales, Victoria, and South Australia. 



Type (fossil) in the Museum of the Geological Society of London. 



After a careful comparison of the recent with the fossil specimens 

 in the Museum collection, I have no hesitation in following 

 Dr. Murie and Mr. Lydekker in looking upon "Ph. plaiyrUmts" 

 as identical with Ph. mitchelli, and consequently in adopting the 

 latter and earlier name for the present species. 



