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  1. By: Willey, Arthur,
    Publication info: New York, Macmillan, 1894
    Holding Institution: Cornell University Library
    Subjects: Amphioxus  Hemichordata  Sea squirts  
  2. By: Willey, Arthur,
    Publication info: New York, Macmillan, 1894
    Holding Institution: MBLWHOI Library
    Subjects: Amphioxus  Hemichordata  Sea squirts  
  3. By: Willey, Arthur,
    Publication info: Cambridge, Eng, University Press, 1900?
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Enteropneusta  Hemichordata  
  4. By: Spengel, Johann Wilhelm,
    Publication info: Berlin, Verlag von R. Friedländer & Sohn, 1893
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Enteropneusta  Hemichordata  Naples, Bay of (Italy)  Protochordates