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This paper is a study of Maquoketa brachiopods designed to supplement the stratigraphic work published by Ladd in 1929. Twenty-two genera and sixty species are described and discussed: Inarticulata, 5; Impunctate Articulata, 22; Pseudopunctate Articulata, 28; Punctate Articulata, 5. Six new genera are erected: Lepidocyclus, Hypsiptycha, Thaerodonta, Tetraphalerella, Megamyonia, and Diceromyonia.

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