Ostiolum formosum, Pratt, Henry S., 1903

Pratt, Henry S., 1903, Descriptions of four distomes. In: Mark anniversary volume; to Edward Laurens Mark, Hersey Professor of Anatomy and Director of the Zoölogical Laboratory at Harvard University, in celebration of twenty-five years of successful work for the advancement of zoölogy., H. Holt and Company : 34

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