234 BIVALVE SHELLS. 



47. CORBICULA TRIANGULARIS. 



C. testa trigona, sequilaterali, alta, tumidula, solida, epidermide 

 fuscescente vestita, transversim irregulariter striato-rugosa, 

 utroque latere aiqualiter declivi ; umbonibus prominentibus, 

 violaceo-lixddis, vel roseis violaceo subradiatis ; valvis intus 

 superne rubescentibus, ad margines violaceis ; cardine incras- 

 sato, inaequaliter tridentato ; dentibus lateralibus crassis, prae- 

 longis, tenuissime striatis. 



Corbicula triangularis, Desh. Proc. Zool. Soc. 1854. 



Hab. ? Coll. Cuming. 



k. Species dubiee. 



48. CORBICULA DEBILIS. 



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

 tnmcata, subajquilaterali, transversira liris confertis, subre- 

 flexis, arata ; epidermide nitido, superne olivaceo induta ; 

 apicibus parum elevatis, erosis, absque lunula ; intus violaceo- 

 albida ; dentibus cardinalibus inconspicuis, lateralibus elon- 

 gatis, striatis. 



Cyrena debilis, Gould, Proc. Bost. Soc. Nat. Hist. iii. 293; 

 United States Expl Exped. Moll. p. 427. f. 529. a, b. 



Hab. In fluvio Hunteriano Novoe Hollandiae. 



An Cyclas ? deficiunt dentes cardinales. 



49. CORBICULA TRIGONELLA. 



C. testa parvula, triangulari, subaequilaterali, fulva, laeviuscula ; 

 natibus subviolaceis. 



Desh. Lamk. An. s. Vert. ed. 2. vi. 273. no. 1. 



Hanley, Descr. Cat. p. 92. 



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



Hab. ? 



50. CORBICULA EUPHRATICA. 



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

 Hab. ? 



Genus 2. BATISSA. 



Animal Cyrenfe simillimum. 



Testa ovata vel subcirculari, subcordata, epidermide viridi oli- 

 vaceo vestita; cardine lato, utriusque valvae tridentato, dentibus 



