BIVALVE SHELLS. 221 



vis ; dentibus cardiualibus duobus utraque valva ; latcralibus 

 lamelliformibus, perpeudiculariter striatis, quatuor valva dextra, 

 duobus sinistra. 



Cyrena Panormitana, Bivona, Niiovi Mollus. Terrest. di Palermo, 

 p. 21. 



Hab. In rivulis Sicilise. 



b. Species Africance. 



2. CORBICULA CONSOBRINA. 



C. testa ovato-trigona, transversa, insequilaterali, tumida, sub- 

 cordata, fusco-virente, transversim tenue sulcata ; latere antico 

 longiore, lato, obtuso, postico valde declivi, brevi, subtruncato ; 

 umbonibus tumidis, obtusis, oppositis, apiee denudato viola- 

 ceis, valvis intus albo-pallide violaceis, ad margines saturati- 

 oribus ; cardine angusto in utraque valva tridentato, dente 

 postico valvae sinistrae obsolete ; dentibus lateralibus angustis 

 insequalibus, antico longiore, cardinem attingente. 



Cyclas consobrina, Caillaud, Voy. a Mero'e, ii. pi. 61. f. 10, 11. 

 An eadem var. ? Savigny, Exp. d'Eg. Moll. pi. 7- f- 7- 



Hab. Flumen Nilum. 



3. CORBICUI A COR. B.M. 



C. testa elongato-trigona, cordata, subaequilaterali, tumida, viridi- 

 fuscescente, transversim tenue et subtiliter sulcata ; umboni- 

 bus prominentibus, involutis, vix obliquis, saepius integris ; 

 lateribus obtusis, posticali paulo breviore, subtruncato ; valvis 

 intus violaceis zonulis saturatioribus ornatis ; cardine angusto, 

 tridentato ; dentibus subsequalibus, posticali valvula dextra 

 apice emarginato ; valvule sinistrae mediano bifido ; dentibus 

 lateralibus angustis, tenue striatis. 



Cyrena cor, Lamk. An. s. Vert. v. 552. no. 3. 

 Deless. Rec. de Coq. pi. 7- f- 7- 



Hab. ? exoriente {Olivier). In Nile superiore. Coll. Cum. 



4. CORBICULA PUSILLA. B.M. 



C. testa parva, tenui, turgidula, ovato-orbiculari, vix trigona, in- 

 aequilaterali, alba ; striis transversis, confertis ; epidermide 

 pallide flava ; dentibus lateralibus elongatis, striatis, cardinali- 

 bus tribus, insequalibus, duobus majoribus in utraque valva 

 bifidis. 



