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  1. By: Hickson, Sydney John, - Versluys, Jan,
    Publication info: Leiden,Buchhandlung und dr. vormals E. J. Brill,1907.
    Holding Institution: Smithsonian Libraries
  2. By: Versluys, Jan,
    Publication info: Jena,G. Fischer,1898.
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library