6 Dall — Revision of Cyrenacea. 



shayes. Eocene of France. I suspect this to be merely a subdivision 

 of Cyrena. 



Genus Cyrena Lamarck, 1818. Type Cyrena bcngalensis Lamarck. 

 Recent. India. 



Section Polymesoda Rafinesque, 1820. Type Cyclas caroliniana Bosc. 

 Recent. South Carolina. Cyprinella and Diodus Gabb, and Leptosiphon 

 Fischer are synonymous. 



Section Pseudocyrena Bourguignat, 1854. Type Cyrena maritima 

 D'Orbigny. Cuba. Anomala Deshayes, not Hiibner, Egeta H. and A. 

 Adams, and Cyrenocapsa Fisher are synonymous. 



Section Oeloina Gray, 1844. Type Cyrena coaxans Gmelin (C. zeylan- 

 ica Lamarck). Recent. Ceylon. 



Section Egetaria Morch, 1861. Type E. pullastra Morch. West coast 

 Central America. 



Section Isodoma Deshayes, 1858. Type /. cyprinoides Deshayes. 

 Eocene of France. 



Subgenus Leptesthes Meek, 1872. Type Corbicula fracta Meek. 

 Eocene of Nebraska 



Genus Corbicula Megerle, 1811. Type Tellina fivminalis Muller. 

 India. 



Section Veloritina Meek, 1871. Type Corbicula durkeei Meek. Cre- 

 taceous of Wyoming. 



Section Corbiculina Dall (nov.). Type Corbicula angasi Prime. Aus- 

 tralia. Smaller and more delicate than Corbicula s. s. and viviparous. 



Section Tellinocyclas Dall (nov.). Type Cyrena tellinella Deshayes 

 Parisian Eocene. Small, heavy, elongate and acute, with short distant 

 lateral teeth. 



Section Cyrenodonax Dall (nov.). Type C. formosana Dall. Recent. 

 Formosa. Like Donacopsis but inflated, without radial sulcation and 

 having an entire pallial line. 



Subgenus Cyanocyclas Ferussac, 1818 (restricted). Type Corbicula 

 limosa Maton. South America. 



Genus Villorita Gray, 1833. Type V. cyprinoides Wood. Indo China 

 and Japan. The name was spelled Velorita by Gray in 1842. 



Genus Batissa Gray, 1853. Type B. tenebrosa Hinds. Australia. 



Genus Egeria Roissy, 1805. Type Venus paradoxa .Born. Rivers of 

 West Africa. Oalatea Bruguiere, Trigona Schumacher not Jurine, 

 Potamophila Sowerby, Oalateola Fleming, and Megadenma Bowdich are 

 synonymous. 



Section Egeria s. s. Type E. paradoxa Born. 



Section Profischeria Dall (nov.). Type Fischeria Delesserti Bernardi. 

 West Africa. This is Fischeria Bernardi, 18G0, not Robineau Desvoidy, 

 1830. 



