226 



21. Lucina (MyrTjEa) strangei, A. Adams. L. testa eequila- 

 terali, solida, ventricosula, lenticulari, albida, costellis radiantibus 

 nodoso-squamosis, sculpta, concentrice sulcata, umbonibus media- 

 nts, vix prominulis ; intus incrassata, alba, margine ventrali 

 crenulato, intus radiatim sulcato. 



Hob. Moreton Bay (Mr. Strange). Mus. Cuming. 



In most of its characters this species approaches L. (Myrteea) 

 LayaMii, but it is much" more ventricose, and the radiating ribs are 

 more imbricately squamose than in that species. 



22. Diplodonta globtilosa, A. Adams. D. testa tenui, rotun- 

 data, subglobosa, vix obliqua, sordide alba, concentrice striolata, 

 umbonibus submedianis, anteversis, latere antico superne excavato, 

 postico rolundato ; cardinis dentibus apicalibus duobus, divaricatis, 

 subobsoletis, lateralibus nullis. 



Hab. Moreton Bay {Mr. Strange). Mus. Cuming. 

 This species appears distinct from any hitherto described, although 

 a great similarity runs through all the species of the genus. 



23. Yoldia gloriosa, A. Adams. Y. testa elongato-transversa, 

 inaquilaterali, utrinque hiatite, lactea, tenui, subpellucida, nitente, 

 latere antico breviore, rotundato, linea impressa, obliqua ex um- 

 bonibus usque ad marginem ventralem, instructo ; latere postico 

 acuminato-rostrato ; concentrice plicato-lirata, plicis tenuibus, 

 confertis, postice obsoletis, antice distantioribus ; margine ventrali 

 sinuato. 



Hab. Singapore. Mus. Cuming. 



A very large and splendid species, having somewhat the character 

 of Y. lanceolata, Sow., but with the cartilage-pit nearer the anterior 

 end, and with the fore part broad and rounded. 



24. Mactra pusilla, A.Adams. M. testa subtrigono-ovata,aqui- 

 laterali, tenui, nitente, concentrice striata, latere postico subangu- 

 lato, area elliptica longitudinaliter sulcata, latere antico longiore, 

 subangulato ; rosaceo-albida, maculis roseis radiatim dispositis, 

 irregulariter picta ; intus roseo variegata ; umbonibus rubiginosis. 



Hab. Moreton Bay {Mr. Strange). 



A small and prettily variegated species of Mactra, with the inte- 

 rior showing the rosy markings of the valves, and of a shining ap- 

 pearance externally. 



25. Ne^era fragilis, A. Adams. N. testa oblong o-ovata, com- 

 pressiuscula, tenui, alba, vitrea, pellucida, nitida, concentrice 

 striata, latere antico breviore, rotundato clauso, postico longiore, 

 acuminato, subrostrato, hiante ; margine ventrali postice sub- 

 sinuaio. 



Hab. Moreton Bay (Mr. Strange). Mus. Cuming. 



This is a delicate glassy and fragile species, somewhat resembling 

 in external appearance a Yoldia. The cartilage is in a projecting 

 cavity of the hinge-plate, and there are no lateral teeth. 



