9. P8EUD0CHIETJS. 173 



three or four inches, beyond which the hairs are straighter and 

 shorter and more adpressed ; its colour at base following that of 

 the body in its proportions of grey and rufous, but its middle third 

 nearly or quite black, and its tip for from one to four inches pure 

 white. Naked part below tip about three or four inches in length, 

 not sharply defined from the hairy part, smooth, transversely 

 striated, not shagreened. 



STcull (PI. XVIII. fig. 5 and PL XIX. fig. 2) elongated, its 

 outlines evenly oval. Nasals flattened, not vaulted above, reaching 

 nearly as far forwards as the premaxiUse ; nasal notch medium, 

 much deeper than in Ps. herbertensis, shallower than in Ps. cooici, the 

 projection of the bones about 5 or 6 millim. beyond their junction 

 with the premaxiUae. Naso-premaxillary much exceeding naso- 

 maxillary suture in length, owing to a narrow projecting process 

 being thrown back from the upper edge of the premaxillae, and 

 running along between the nasals and maxiUse, and reducing the 

 actual suture between these bones to about 4 millim. Interorbital 

 region much constricted, slightly concave above ; its edges square, 

 sharp, not round and inflated. Anterior palatine foramina extend- 

 ing backwards to the level of the diastema between p.' and p.' 

 Posterior palate with one or two pairs of small vacuities. BuUse 

 swollen, transparent. 



Teeth (PI. XVIII. fig. 5). Upper i.^ comparatively small and 

 short, not exceeding i.^ by an amount equal to the height of that 

 tooth. Canine about equal to i.' and twice the size of p.' P.' about 

 half the size in section of p.* Molars large and heavy (see skull 

 dimensions). Upper m.* comparatively short, its internal .antero- 

 posterior length about 3 or 3"5 miUim., rarely amounting to 4. 

 Lower intermediate teeth one, two, or three; seldom all aborted. 



Dimensions. 



?• 

 h (stuffed). 

 Adult, 

 millim. 



Head and body 390 



Tail 340 



Lower leg (c.) 80 



Hind foot 42 



Ear 37 



SkuU, see p. 185. 



Hob. Queensland, New South Wales, Victoria, and South Australia. 



Type not in existence. 



The interpretation of the relations between this and the next 

 two species is a matter of considerable doubt. On the whole it 

 appears to be most convenient to recognize the Tasmauian form 

 as distinct, and consequently the Western Australian as well, the 

 latter being apparently more nearly allied to the Tasmanian than to 

 the Eastern Australian animal. The differences it is true are slight. 



