222 BIVALVE SHELLS. 



Cyrena pusilla, Phil. Ahbild. Conch. p. /8. pl. 1. f. 7- 

 Cyrena africana, var. jB, Krauss, Sudafr. Moll. p. 9. 



Hab. Partem superiorem flurainis Nili. 



5. CORBICULA RADIATA. B.M. 



C. testa parva, tenui, orbiculato-trigona, aequilaterali, liviila, ad 

 apices alba, violaceo radiata ; striis transversis, remotiusculis, 

 epidermide nitidissimo ; pagina interna violacea ; dentibus late- 

 ralibus elongatis, striatis ; dentibus cardinalibus angustis, duo- 

 bus majoribus apice vix bifidis. 



Cyrena radiata, Phil. (1846) Abbild. Conch. p. 4. no. 8. pl. 1. f. 8. 

 (non Hanley, 1844). 



Cyrena africana, var. a, Krauss, Sudafr. Moll. p. 8. 



Hab. In Nilo Albo. 



6. CORBICULA AFRICANA. B.M. 



C. testa parva, orbiculato-trigona, compressiuscula, subaequilate- 

 rali, antice latiore, obtusiore, transversim dense et in-egulariter 

 striata, olivaceo-glaucescente nitida, intus violacea; umbonibus 

 minimis, gibbosulis, erosis, cardine angusto, tridentato,dentibus 

 minimis, duobus approximatis, sequalibus, apice canaliculatis ; 

 dentibus lateralibus angustis, elongatis, tenuissime striatis ; im- 

 pressionibus muscularibus minimis, rotundatis. 



Cyrena africana, Krauss, Sudafr. Moll. p. 8. pl. 1. f. 8, varieta- 

 tibus exclusis. 

 Hab. Caput Bonae Spei. 



c. Species Asiaticce. 



7. CORBICULA FLUMINALIS. 



C. testa triangulari, transversim striata, crassa, dura, valde gibba, 

 opaca, antice versus cardinem latiore, quam postice ; extus 

 viridi, crebro striatim imbricata ; stria3 transversae ; valvis intus 

 cyaneis ; cardine in utraque valva tridentato, dentibus divari- 

 catis, subffiqualibus, postico emarginato ; dentes laterales elon- 

 gati utroque latere tenue striati ; striis tenuibus, perpendieu- 

 lariter parallelis. 



Tellina fluminalis, Mull. Verm. Hist. ii. 205. 



Venus fluminalis, Chemn. Conch. vi. 319. pl. 30. f. 320. 

 Wood,Ind. Test.^X.^.i. 113. 



Tellina fluminalis, Schrot. Flussconch. p. 195. no. 20. 

 Gmel. p. 3242. no. /9. 



Cyclas fluminalis, Blainv. D. S. N. xii. 280. 



