bivalve shells. 243 



4. Cyrena Bengalensis. B.M. 



C. testa subcordata, trigona, inajquilaterali, tumidinscula, crassa, 

 solida, alba sub epidermide squalide fuscescenti, transversim 

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

 teriore dorsali parum convexo ; margine inferiore vix arcuato ; 

 umbonibus erosis oblique incurvatis parum proininentibus ; 

 valvis iutus albis, cardine iiicrassato, oblique tridentato ; den- 

 tibus subparallelis sensim crescentibus, duobus in valva dextra 

 bifidis uno mediano in valva sinistra ; antico minore, dentibus 

 lateralibus maximis, brevibus, simplicibus; impressione pallii 

 prope marginem inferiorem descendentej nymphis latis, de- 

 pressis ; ligamento angusto, brevi, partini immerso. 



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

 Deless. Rec. de Coq. pi. 7. f. 6. a-d. 



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

 pi. 13. f. 14. 



Hab. In rivulis Bengalensibus. 



• 



5. Cyrena Buschii. B.M. 



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

 tumidiuscula ; epidermide olivaceo-viridi vel castanea, regula- 

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

 rectilineo,planiusculo ; postico convexiusculo, ad extremitatem 

 obtuso ; inferiore parum arcuato ; umbonibus oblique promi- 

 nulis, ssepius integris, cardine angusto, dentibus cardinalibus 

 tribus, inajqualibus, sensim crescentibus, duobus posticis valvae 

 dextrae anterioribus, valvse sinistrae bifidis, dentibus lateralibus 

 brevibus, antico cardine apjiroximato. 



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



Hab. China. 



6. Cyrena expansa. 



C. testa crassiuscula, subinflata, inajquilaterali, rotundato-tri- 

 gona, lineis transversis sequidistantibus, antice punctatis, pos- 

 tice crispulatis oruata, nitida, extus vii-idi-lutea, intus tota 

 alba ; margine cardinal!, brevi, anterior! et inferior! rotundatis ; 

 posteriori subexpanso, infra angulato; dentibus cardinalibus 

 duobus bifidis, tertio siniplici, in valva dextra anterior!, in 

 sinistra posteriori ; dente lateral! antico subapproximato, pos- 

 teriori subremoto. 



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

 Hab. Insula Javanica {Mousson). 



11* 



