Abstract
Abstract The anatomy of the females of Herpyllobius polynoes (Kroyer), H. arcticus Steenstrup & Lutken, and Eurysilenium truncatum Sars is described. They are parasites of polynoid worms and nourish on the host's body fluid by means of a true intestine (lacunar system of earlier authors) with epithelial walls; this is a simple tube in Eurysilenium and is subdivided into a large number of branches in Herpyllobius; an anus is absent. The intestine is restricted to the endosoma and materials are conveyed to the ectosoma by a tubular transport system in the mesenchyme in Herpyllobius; its equivalent is absent in Eurysilenium. The reproductive system is restricted to the ectosoma and consists in both genera of fused left and right ovaries, two cement glands, an unpaired receptaculum seminis and two vesicles that possibly correspond to reduced oviducts. After comparison with other parasitic cope pods it appears that the top side of the ectosoma in Eurysilenium roughly corresponds to the dorsal side, whereas thi...
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