114 . MACEOPODID^. 



q-s. Skulls. Dirk Hartog's Isl., F. M. Eayner, Esq. 



Sharks Bay, W.A. [P. & 0.]. 



( Voy. H.M.S. 'He- 



raW). 

 . 3 Ad. St. 1 , Zool. Soc. 



*• 1 Skeleton. ( °- 



M. Skeleton, mounted. Zool. Soc. 



V. Yg. skeleton. Zool. Soc. 



w. Skull. No history. 



10. CALOPRYMNUS. „ 



Type. 



Genus noTum 0. campestris. 



Ehinarium naked as in Bettongia, but the edge of the hairy part 

 less emarginate backwards in the centre. Ears short, rounded, 

 hairy. Limbs as in Bettongia. Tail thin, cylindrical, evenly short- 

 haired, -without trace of a crest, the hairs of the upper surface as 

 short as or even shorter than those on the sides and below. 



SJcull (PI. XIV. fig. 9) broad and flattened, with a peculiarly 



short, broad and conical muzzle, quite unlike that of any other 



Marsupial. Nasals very large, enormously broadened behind ; the 



frontal processes of the premaxillae reduced to mere narrow strips. 



Supraorbital edges sharp and overhanging. Anterior palatine 



foramina long, encroaching as far backwards into the maxiUee as 



forwards into the premaxillae. Posterior palate as in Bettongia. 



BullsB large, swollen, smooth and transparent. Lower jaw short 



and thick, convex below. 



Dentition-— 1 ^-^-^ C i P ^•"■^■^ M '■^•^•* y2-34 

 jjenmion. j.. , .o .o' ^' o' ■'^- o .0.3.4' -""■• i.2 . 8 .4^^ — ^*- 



Upper i.' broad and strong, i.^ small, i.' medium, much slanted 



forwards. Canine very small, almost rudimentary, and therefore 



very diiferenfc from that of the rest of the subfamily. P.* 



shorter than in Bettongia, and with only a few shallow grooves 



placed vertically ; its postero-internal talon large. P.' similar 



to p.*, but shorter and smaller. Molars quadrangular, but their 



pattern rather more folded and complex than in Bettongia, and more 



resembling that found in .^ipyprymrms. M." rather, but not very 



much, smaller than m.' 



Bange. South Australia. 



This genus is formed to contain the remarkable animal hitherto 



known as Bettongia campestris, a species whose external characters and 



general shape of skull resemble those of Bettongia, whose molars have 



the structure of those of JSpyprymnus, whose p.'' resembles that of 



Potorous, and the structure of whose nasal region is wholly peculiar 



to itself. Its position being thus intermediate between the other 



genera, no extension of their limits would bring it within one rather 



than another, and therefore, without amalgamating all the genera 



of the subfamily, a new genus is clearly necessary for its reception. 



