Late Mississippian fauna from the Redoak Hollow formation of southern Oklahoma, part 4

Twenty-one species and varieties of gastropods are described, eight new; apparent relation of most forms to British Lower Carboniferous species is indicated. The genera Retispira Knight, Patellilabia Knight, Trepospira Girty, and Cyclozyga Knight are discussed and lowered in rank to subgenera. The genus Amaurotoma Knight is discussed, and Pseudozygopleura Knight is considered a junior synonym of Zygopleura Koken. Five species of cephalopods are described, two new; presence of Eumorphoceras girtyi Elias indicates correlation with basal Namurian (El) of Europe. Twenty-three species and varieties of ostracodes are described, fifteen new. Morphology of the genus Deloia is discussed. The new genus Clarkeolepis and three new species of Thoracica are described. The problematic genus Cyclopuncta is introduced for scars attributed to a Folliculina-like organism.