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  1. By: Schaeffer, Asa A. (Asa Arthur),
    Publication info: Princeton, Princeton university press; [etc., etc.], 1920
    Holding Institution: MBLWHOI Library
  2. By: Schaeffer, Asa A. (Asa Arthur),
    Publication info: Princeton, Princeton University Press, 1920
    Holding Institution: Francis A. Countway Library of Medicine
  1. By: Schaeffer, Asa A. (Asa Arthur),
    Type: Article
    In: The Biological bulletin
    Volume: 32
    Date: 1917-02-01
    Page Range: 45--742
    Publication Info: Woods Hole, Mass Marine Biological Laboratory