bivalve shells. 259 



54. Cyrena cordiformis. 



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

 epidermide obscure viridi-alba ; umbonibus purpui-eis, pro- 

 miuentibus, antice reflexis, et conniventibus ; area purpureo 

 bizonata, externe angulo circumdata, basi parum emarginata ; 

 lunula obsoleta; dentibus cardiualibus tribus divergentibus, 

 duobus anterioribus parum emarginatis ; dente lateral! angusto, 

 robusto, cardiualibus approximato; postico lamelliformi, re- 

 moto. 



Cyrena cordiformis, Recluz, Journ. de Conch. 1853, p. 251. pi. 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, attenuate, 

 acuminato; cardine angustissimo, dentibus tribus primariis 

 suba^qualibus, minimis, compressis, divergentibus, majoribus 

 apice profunde furcatis, lateralibus angustissimis, laminatis, 

 aequalibus, distantibus, margine sulco angusto profunde sepa- 

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



CjTcna (anomala) Peruviana, Desk. Proc. Zool. Soc. 1854. 



Hab. Tumbez in littore Peruviano. Coll. Cuming. 



56. Cyrena salmacida. 



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

 productiore, subrostrato, transversim tenuiter sulcata, albes- 

 cente vel carnea, stramineo vel cffiruleo nebulosa ; umbonibus 

 fulvo-rubellis et fascia late diluta concolore circumdata; cardine 

 stricto ; dentibus primariis tribus minutis ; lateralibus duobus 

 elongatis, tenuibus. 



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



Hab. ? 



57. Cyrena angulat\. 



C. testa trigona, tiu-gidula, sequilaterali, solidula, laevigata; epi- 

 dermide squalide fuscescente vestita; umbonibus miuimis, de- 

 pressis, oppositis, latere antico atque postico sequaliter con- 



