40 POTORUS. 



3. POTOROUS TRIDACTYLUS, Kerr, sp. (1792). 

 Common Rat-Kangaroo. 



Size variable, large, or medium. Other external characters a s 

 in P. gilberti, but the naked part of the rhinarium extends rathe r 

 further backwards. 



Dimensions. Head and body about sixteen and a half inches ; 

 tail about nine inches ; hind foot from two-thirds to four-fifths of 

 an inch. 



Habitat. New South Wales, Yictoria, South Australia and 

 Tasmania. 



References. Thomas, B.M. Catal. p. 117, pis. xi. fig. 13 (rhin- 

 arium), xiii. fig. 12 (fourth premolar), xiv. fig. 10 (nasals); Gould, 

 Mamm. Austr. ii. pis. Ixvii. (P. murinus), Ixviii. (P. apicalis). 



The two Tasmanian forms, P. apicalis which is larger and P. 

 rufus which is smaller than continental examples may prove to 

 be good species. 



Genus III. CALOPRYMNUS, Thomas (1888). 



Rhinarium naked. Ears short and rounded. Fore-claws long 

 and strong. Hind feet longer than the head, their soles naked 

 and coarsely granulated. Tail thin, cylindrical, evenly short- 

 haired, without trace of crest. 



Denfitim T 1 2 ' 3 O \ P ' 3 ' 4 M L2 - 3 - 4 v 2-34 

 " i- iTO> u< o' r ' 00X4' 1V1 - O^4 x J ~ 



Habits. Terrestrial ; herbivorous. 



1. CALOPRYMNUS CAMPESTRIS, Gould, sp. (1843). 

 Plain Rat-Kangaroo. 



Size large. Form slender and delicate. Face broad between 

 the orbits. Fur soft and straight. General color above grizzled 

 sandy, darker on the back, brighter on the sides ; below pale 

 sandy-white. Ears with close, short, yellow hairs. Arms and 

 legs bright sandy rufous ; hands and feet white, the hairs quite 

 short. Tail sparsely clothed with pale yellowish hairs, which are 

 closest on the underside of the tip. Centre of chest naked and 

 apparently glandular. 



Dimensions. Head and body about eighteen inches ; tail about 

 fourteen inches. 



Habitat. South Australia. 



References. Thomas, B.M. Catal. p. 115, pis. xiii. lig. II (fourth 

 premolar), xiv. fig. 9 (upper view of skull); Gould, Mamm. Austr. 

 ii. pi. Ixvi. 



