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  1. Die Alcyoniden der Siboga-expedition. I. Coralliidae, by Sydney J. Hickson ... II. Pseudocladochonus hicksoni n. g. n. sp., von Dr. J. Versluys ... Mit 3 tafeln und 16 figuren im text.
    By: Hickson, Sydney John, - Versluys, Jan,
    Publication info: Leiden,Buchhandlung und dr. vormals E. J. Brill,1907.
    Holding Institution: Smithsonian Libraries
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  2. Die mittlere und äussere Ohrsphäre der Lacertilia und Rhynchocephalia.
    By: Versluys, Jan,
    Publication info: Jena,G. Fischer,1898.
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
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