First issued in release COL22.5.
Last used in release COL23
Published in
King, W. (1850). A Monograph of the Permian Fossils of England. Palaeontographical Society Monograph. London, 30: i–xxxviii + 1–258 p., 28 pl. https://www.molluscabase.org/aphia.php?p=sourcedetails&id=195725