bivalve shells. 259 



54. Cyrena cordiformis. 



C. testa cordiformi, inflata, concentrice tenue striato-sulcata, sub 

 e})i(lermide obscure viridi-alba; umbonibus purpureis, pro- 

 minentibus, antice reflexis, et conniventibus ; area purpureo 

 bizonata, externe angulo circumdata, basi parum emarginata ; 

 lunula obsoleta; dentibus cardinalibus tribus divergentibus, 

 duobus anteriorilDus parum emarginatis ; dente laterab angusto, 

 robusto, cardinabbus approximato; postico lamelliformi, re- 

 raoto. 



Cyrena cordiformis, Recluz, Journ. de Conch. 1853, p. 251. pl. 7. 



f. 9. 

 Cyrena (anomala) cordiformis, Desh. Proc. Zool. Soc. 1854. 



Hab. ? 



55. Cyrena Peruviana. 



C. testa orbiculato-trigona, turgida, cordiformi, subaequilaterali, 

 tenui, fragili, transversim tenuissime striato-punctata ; umbo- 

 nibus magnis, prominentibus, oppositis, integris ; latere an- 

 tico paulo breviore, late semicirculari, postico declivi, attenuato, 

 acuminato; cardine angustissimo, dentibus tribus primariis 

 suba;qualibus, minimis, compressis, divergentibus, majoribus 

 apice profunde furcatis, lateraUbus angustissimis, laminatis, 

 sequalibus, distantibus, margine sulco angusto profunde sepa- 

 ratis ; valvis intus albo-flavis, postice squalide violaceis. 



Cyrena (anomala) Peruviana, Desh. Proc. Zool. Soc. 1854. 



Hab. Tumbez iu littore Peruviano. Coll. Cuming. 



56. Cyrena salmacida. 



C. testa insequilaterali, ovali, antice rotundata, latere postico 

 productiore, subrostrato, transversira tenuiter sulcata, albes- 

 cente vel carnea, stramineo vel ca^ruleo nebulosa ; umbonibus 

 fulvo-rubellis et fascia late diluta concolore circuradata; cardine 

 stricto ; deutibus priraariis tribus rainutis ; lateralibus duobus 

 elongatis, tenuibus. 



Cyrena salraacida, Morelet, Test. Nov. Cub. pt. 2. p. 26. no. 150. 



Hab. ? 



57. Cyrena angulata. 



C. testa trigona, turgidula, {cquilaterali, solidula, lajvigata; epi- 

 derraide squalide fuscescente vestita ; umbonibus miuirais, de- 

 pressis, oppositis, latere antico atque postico ajqualiter con- 



