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  1. By: Fraipont, Julien,
    Publication info: Berlin, R. Friedländer & sohn, 1887
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Annelida  Naples, Bay of (Italy)  Polychaeta  Polygordius  
  2. By: Woltereck, Richard,
    Publication info: Stuttgart, E. Nägele, 1902-
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Embryology  Polygordius  Worms