VOL. XVI, PP. 5-8 FEBRUARY 21, 1903 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON REVIEW OF THE CLASSIFICATION OF THE CYRENACEA. BY WILLIAM H. DALL. In working over the Cyrenacea for the Memoir on the Ter tiary Fossils of Florida, in course of publication by the Wagner Institute of Science, it was found that both the nomenclature and the classification were in a state of deplorable confusion. While the details are reserved for that memoir, it was thought that a synopsis of the arrangement adopted might be of use to the students of the group, and it is herewith presented. Family Cyrenidtt. Genus Miodontopsia Ball (nov.). Type Cyrena media Sowerby. Juras sic. This is Miodon Sandberger, 1870, not Carpenter, 1865. Genus Loxoptychodon Sandberger, 1872. Type Cyrena intermedia De-shayes. Lower Eocene, France. Genus Plesiastarte Fisher, 1887. Type P. crenulata Deshayes (as Cyrena). Lower Eocene, France. This is Anomala Cossmann, 1886, not Hubner, 1816. Genus Ditypodon Sandberger, 1872. Type Cyrena suessii C. Mayer. Lower Pliocene of Italy. ?Genus Donacopsis Sandberger, 1872. Type Cyrena acutangularis De-S-PROC. BIOL. Soo. WASH. VOL. XVI, 1903. (6)
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