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Cutler, Edward B; Cutler, Norma J. (1985). A revision of the genera Phascolion Théel, and Onchnesoma Koren and Danielssen (Sipuncula). Proceedings of the Biological Society of Washington. 98(4): 809-850.
Cutler, Edward B; Cutler, Norma J. (1985). A revision of the genera Phascolion Théel, and Onchnesoma Koren and Danielssen (Sipuncula). Proceedings of the Biological Society of Washington. 98(4): 809-850.
