bivalve shells. 243 



4. Cyrena Bengalensis. B.M. 



C, testa subcordata, trigona, inaequilaterali, tumidiuscula, crassa, 

 solida, alba sub epidermide squalide fuscescenti, transversim 

 irregulariter striata ; latere antico valde declivi, planulato, pos- 

 teriore dorsali ])arum convexo ; margine inferiore vix arcuato ; 

 umbonibus erosis oblique incurvatis parum prominentibus ; 

 valvis intus albis, cardine incrassato, oblique tridentato ; den- 

 tibus subjmrallelis sensim crescentibus, duobus in valva dextra 

 bifidis uno mediano in valva sinistra; antico minore, dentibus 

 lateralibus maximis, brevibus, simplicibus; impressione pallii 

 prope marginera inferiorem descendente; nymphis latis, de- 

 pressis ; ligamento angusto, brevi, partim immerso. 



Cyrena Bengalensis, Desh. Lamk. An. s. Vert. ed. 2. vi.276.no. 10. 

 Deless. Rec. de Coq. pl. /• f. 6. a-d. 



Hanley, Descr. Cat. p. 91 ; in Wood, Ind. Test. Suppl. 2. 

 pl. 13. f. 14. 



Hab. In rivulis Bengalensibus. 



6. Cyrena Buschii. B.M. 



C. testa trigono-orbiculari, infequilaterali, alba, incrassata, solida, 

 tumidiuscula ; epidermide olivaceo-viridi vel castanea, regula- 

 riter concentrice laraellata ; latere antico brevi, obtuso, declivi, 

 rectilineo, planiusculo ; postico convexiusculo, ad extremitatera 

 obtuso ; inferiore parum arcuato ; umbonibus oblique promi- 

 nulis, saepius integris, cardine angusto, dentibus cardinalibus 

 tribus, inaequalibus, sensira crescentibus, duobus posticis valvae 

 dextree anterioribus, valvse sinistrse bifidis, dentibus lateralibus 

 brevibus, antico cardine approximato. 



Cyrena Buschii, Phil. Abbild. Conch. p. 8. no. 2. pl. 2. f. 2. 



Hab. China. 



6. Cyrena expansa. 



C. testa crassiuscida, subinflata, ingequilaterali, rotundato-tri- 

 gona, lineis transversis aequidistantibus, antice punctatis, pos- 

 tice crispulatis ornata, nitida, extus viri(U-hitea, intus tota 

 alba ; margine cardinah, brevi, anteriori et inferiori rotundatis ; 

 posteriori subexpanso, infra angulato ; dentibus cardinalibus 

 duobus bifidis, tertio simphci, in valva dextra anteriori, in 

 sinistra posteriori ; dente laterah antico subapproximato, pos- 

 teriori subremoto. 



Cyrena expansa, Mousson, Moll. Java, p. 89. no. 6. pL 14. 



Hab. Insula Javanica (Mousson). 



11* 



