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By: Waterman, Talbot H. (Talbot Howe), - Nunnemacher, Rudolf F - Chace, Fenner A. (Fenner Albert), - Clarke, George L. (George Leonard),Type: ArticleIn: The Biological bulletinVolume: 76Series:Issue:Date: 1939-04-01Page Range: 256--279Publication Info: Woods Hole, Mass Marine Biological LaboratorySubjects: