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  1. By: Melvill, James Cosmo - Ponsonby, John H
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 8
    Series: 6
    Date: 1891
    Page Range: 237--240
    Publication Info: London Taylor and Francis, Ltd
  2. By: Ponsonby, John H
    Type: Article
    In: Proceedings of the Malacological Society of London
    Volume: 1
    Date: 1894-03-01
    Page Range: 56--56
    Publication Info: London, Dulau,