Abstract
Two new species of Heterocineta, ectoparasitic on the gills and mantle of fresh water prosobranch snails, are described: H. goniobasidis*, from Goniobasis plicifera silicula and H. fluminicolae, from Flumi-nicola virens, both from Oregon. H. janickii*, found originally on Physa fontinalis and on P. cooperi, is described for comparative purposes. Enerthecoma properans*, found on Viviparus fasciatus and on V. malleatus, is also described.

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