BIOLOGICAL SCIENCES 21 SECTION A, BIOLOGICAL SCIENCES SUBSECTION ZOOLOGY The Recent Gastropoda of Oklahoma. Part I, Historical Review, General Comments and Higher Taxonomic Categories.·

The compilation of molluscan species lists for the tract of land at present encompassed by the political confines of Oklahoma was started by Simpson in 1888. Simpson, as well as most other early workers, listed shells obtained near railroad stops. Consequently, the type localities for the few snails which have been described as new from Oklahoma are still easily revisited. Thirty-four forms were listed In this first paper, to which Pilsbry (1899, 1903) appended additional data from the same localI-ties. New localities, species and subspecies were described by Ferris