Abstract
The genus Renicola Cohn, 1904 is reviewed, with descriptions of the successive stages in the life-cycle of Renicola thaidus. Asexual generations occur in Thais lapillus; metacercariae encysted in bivalve mollusks, especially Mytilus edulis and Pecten irradians; juvenile and adult worms were recovered from the renal tubules of Larus argentatus. The cercariae did not encyst in the fishes exposed to them. Similar larvae occur in Thais emarginata, Thais lamellosa, and Searlesia dira taken at Friday Harbor, Washington. Problems of specificity and systematics are considered.

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