66 
7 T. quadriradiata. Deshaycs. Ceylon ? SirW.Denison. 
8 T. radiata. Chemnitz. Indian Ocean. 
9 T. rotundata. Linnzeus. Ceylon.* 
10 T. textrix. Chemnitz Malacca.* 
11 T. virginea. Linnzus. Britain. 
Genus.—_VENERUPIS. Lamarck, 1818. 
1 V. Irus. Linneus. Britain. 
Grenus.—CYPRICARDIA. Lamarck, 1819. 
1 C. vellicata. Reeve. Philippines. 
Famiry 11.—PETRICOLIDZ. 
Genus.—PETRICOLA. Lamarck, 1801. 
1 P. lithophaga. Retzius. Mediterranean. 
Famity 12.—GLAUCONOMYID, 
Genus.—GLAUCONOMA. Gray, 1828. 
1 G. rugosa. Hanley. Malacca. 
Famiry 13.—CYPRINIDZ. 
Genus.—CYPRINA. Lamarck, 1812. 
1 C. islandica. Lamarck. Britain. 
Famitry 14—CYRENIDE. 
Genus.—CYRENA. Lamarck, 1806. 
1 C. Bengalensis. | Deshayes. Sunderbunds, 
Bengal. Mr.W.T.Blanford. 
2 C. Ceylanica ? Chemnitz. Rutnagherry. : 
3 C. fuscata. Lamarck. Moulmein. 
4 C. Malaccensis. 9 Malacca. 
5 C. Sumatrensis. Sowerby. Sumatra.* 
Genus.—CYCLAS. Bruguiére, 1792. 
1 C. cornea. Linneus. Britain.* 
2 C. Linslayi r¢ America ?* 
3 C. modesta. Pfeiffer. ie 
4 C. nucleus. Normand. Bordeaux. M.J.L.Laporte 
5 C. ovalis. Stimpson. _ a % 
6 C. partumeia. Say. America.* 
7 C. similis. ne As * 
ry td 
Genus,—PISIDIUM. Pfeiffer, 1821. 
. dubium. Say. America. 
. pusillum. Gmelin. Britain. 
