Zoological Society. 389 



lineis longitudinalibus castanets vivide pictd ; umbonibus centra- 

 libus. 

 Conch. Icon., Pectunculus, pi. 5. f. 25. 

 Hab. West Indies. 



The painting of this species is not much unUke that of the Pectun- 

 cuius pennaceus ; the anterior side of the shell, however, is white and 

 very peculiarly lineated. 



Pectunculus obliquus. Pect. testd transversa, obliqu^ ovatd; 

 albido-rufescente, maculis cuspidiformibus spadiceis profuse pictd ; 

 intus nigerrimo-fuscd ; umbonibus centralibus. 

 Conch. Icon., Pectunculus, pi. 6. f. 33. 

 Hab. Swan River. 



The whole of the inside of this shell, with the exception of the an- 

 terior margin and muscular impression, is of a very^deep blackish 

 brown. 



Pectunculus TfiLLiNiEFORMis. Pect. testd ovatd, transversd, sub- 

 depressd, radiat\m costatd, costis subobsoletis ; albidd, antice et 

 superne carneo-fusco tinctd ; intus subfuscd, postic^ albicante ; 

 umbonibus vix obliquis. 

 Conch. Icon., Pectunculus, pi. 6. f. 34. 

 Hab, Rio Janeiro. 



This shell differs from the preceding in being more transverse and 

 faintly ribbed ; the interior is not so dark, nor does the outer surface 

 exhibit the least indication of any spots or other dark marks. 



Pectunculus tenuicostatus. Pect. testd orbiculari, subventri- 

 cosd, subtilissime costatd, costis quasi filis, numerosis, interstitiis 

 epidermide lineariter insertd ; fuscescente, costis pallidioribus ; um- 

 bonibus sub centralibus. 

 Conch. Icon., Pectunculus, pi. 6. f. 35. 

 Hab. Australia. 



The valves of this shell are entirely covered with beautiful thread- 

 like ribs, and the interstices are filled with fine roots of epidermis, 

 arranged in from three to four rows. 



Mr. Gould then called attention to a new species of Kangaroo-rat, 

 which he exhibited, and thus characterizes : — 



Bettongia campestris. Bett. vellere longo, molli ; corpore suprvL 

 fusco, albo-penicillato, subths sordide albo ; auribus mediocribus 

 intus pilis sordide albis, subflavescentibus tinctis ; tarsi longi, gra- 

 ciles, pilis pallidis, flavescenti-lavatis ; caudd longd {capite corpo- 

 reque fere cequante) plerumque pilis brevibus, adpressis, pallide 

 rufo-flavescentibus vestitd, subtus et ad apicem pallidiore. 



unc lin. 

 Longitudo ab apice rostri ad caudae basin. ... 15 9 



ad basin auris .... 2 8 



auris I 1 



Cauda 14 



tarsi digitorumque 4 10 



Hab. South Australia. 



In the texture and colouring of the fur this little animal greatly 

 resembles the common European Hare. The under-fur is dense. 



