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Cook, D.G,. (1969). The Tubificidae (Annelida, Oligochaeta) of Cape Cod Bay with a taxonomic revision of the genera Phallodrilus Pierantoni, 1902, Limnodriloides Pierantoni, 1903 and Spiridion Knollner, 1935. The Biological Bulletin 136. 136:9-27.