2.'}4 BIVALVE SHELLS. 



47- CORBICULA TRIANGULARIS. 



C. testa trigona, scquilaterali, alta, tumidnla, solida, epidermide 

 fuscesoeiite vcstita, traiisversim irrcgulariter striato-rugosa, 

 utroque latere sequaliter dcolivi ; umbonibus prominentibus, 

 violaceo-lividis, vel roseis violaceo subradiatis ; valvis intus 

 siii)criie rubesccntibiis, ad marlines violaceis ; cardine incras- 

 sato, iniequaliter tridcntato ; dentibus lateralibus crassis, prse- 

 longis, tenuissiine striutis. 



Corbicula triangularis, Desk. Proc. Zool. Soc. 1864. 



Hab. ? Coll. Cuming. 



k. Species dubiee. 



48. Corbicula debilis. 



C. testa pana, tenui, transverse ovata, postice ampliata, et sub- 

 truncata, subsequilaterali, transversira liris coiifertis, subre- 

 flexis, arata ; epidermide nitido, superne olivaceo induta ; 

 apicibus parum elcAatis, erosis, absque lunula ; intus \-iolaceo- 

 albida ; dentibus cardiualibus inconspicuis, lateralibus elon- 

 gatis, striatis. 



Cyrena debilis, Gould, Proc. Bost. Soc. Nat. Hist. iii. 29.S ; 

 United States Expl. Exped. Moll. p. 42/. f. 529. a, b. 



Hab. In flmno Hunteriano Novae IloUandiai. 



An Cyclas ? deficiunt dentes cardinales. 



49. Corbicula trigonella, 



C. testa parAula, triangulari, subajquilaterali, fulva, laeviuscula ; 

 natibus sub violaceis. 



Desk. Lamk. An. s. Vert. ed. 2. vi. 2/3. no. 1. 



Hanley, Descr. Cat. p. 92. 



Anton, Verz. der Conch, p. 13. no. 498. 



Hab. ? 



50. Corbicula Euphratica. 



Bronn, System. Urwelt. Conch, pi. 4. f. 10. 

 Hab. ? 



Genus 2. BATISSA. 



Animal Cyrena; simillinnnn. 



Testa ovata vel subeirenlari, svibcordata, epidermide viridi oli- 

 vaceo vestita; cardine lato, utriusquc valvic trideutato, dentibus 



