Abstract
A new longifurcous, pharyngeate, distome cercaria has been found to develop in the marine bivalves Hiatella arctica (L.) and H. striata Fleuriau. This larva was present in 12 of 200 specimens of H. arctica collected from Drake's Island during the summer months (May-August) of 1952,.while the same parasite was found in 15 of 100 specimens of the limestone borer, H. striata, dredged from Plymouth Sound during June and July of the same year.

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