Abstract
Gravid adults of Archigetes jowensis sp. n. are described from the intestine of the cyprinid fish, Cyprinus carpio L. and from the seminal vesicle of the tubificid oligochaete, Limnodrilus hoffmeisteri Claparede from the Iowa River, Hardin County, U.S.A. A. iowensis occurs in tubificids throughout the year, but infection of carp is strictly seasonal. Cestodes becoming gravid in oligo-chaetes are believed to represent neotenic procercoids of those found in carp.

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