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Chester gastropods from southern Illinois, eastern Missouri, and north-western Kentucky are described. The method used in discriminating the immature from adult individuals is explained. Fifty-three named species, 20 undetermined species and four variants are described. Four new genera are as follows: Yochelsonospira Wellergyi Kinkaidia

Chesterian (Upper Mississippian) Gastropoda of the Illinois basin / [by] Myint Lwein Thein -- and Matthew H. Nitecki --.