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 bengalemis Lamarck. 

 Recent. India. 



Section Polymesoda Rafmesque, 1820. Type Cyclas caroliniana Bosc. 

 Recent. South Carolina. Cyprinella and Dioclus 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 Geloina 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 7. cyprinoides Deshayes. 

 Eocene of France. 



Subgenus Leptesthes Meek, 1872. Type Corbicula fracta Meek. 

 Eocene of Nebraska 



Genus Corbicula Megerle, 1811. Type TelUna jluminalis Miiller. 

 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 Vittorita 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. Galatea Bruguiere, Trigona Schumacher not Jurine, 

 PotamopJiila Sowerby, Oalateola Fleming, and Megadexma 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, 1860, not Robineau Desvoidy 

 1830. 



