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  1. Amphioxus and the ancestry of the vertebrates,
    By: Willey, Arthur,
    Publication info: London,Macmillan,1894.
    Contributed by: Cornell University Library
    Subjects: Amphioxus  Hemichordata  Sea squirts  
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  2. Amphioxus and the ancestry of the vertebrates. With a preface by Henry Fairfield Osborn.
    By: Willey, Arthur,
    Publication info: New York,Macmillan,1894.
    Contributed by: MBLWHOI Library, Woods Hole
    Subjects: Amphioxus  Hemichordata  Sea squirts  
    BHL Collections: MBLWHOI Library, Woods Hole
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  3. Die Enteropneusten des Golfes von Neapel und der angrenzenden Meeres-Abschnitte / von Dr. J.W. Spengel. Herausgegeben von der Zoologischen Station zu Neapel.
    By: Spengel, Johann Wilhelm,
    Publication info: Berlin :Verlag von R. Friedländer & Sohn,1893.
    Contributed by: Smithsonian Libraries
    Subjects: Enteropneusta  Hemichordata  Naples, Bay of (Italy)  Protochordates  
    BHL Collections: Smithsonian Institution Libraries
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