Abstract
Two new spp. of lumbrinerid-like polychaetes (Superfamily Eunicea, Family Arabellidae), living as parasites in other polychaetes (Eunicea, Onuphidae), are described: Drilonereis benedicti in Onuphis magna, Florida; D. caulleryi in O. conchylega, off Massachusetts to off Virginia. Young arabellids living parasitically in the onuphid, Diopatra cuprea, Massachusetts, are described and are thought to be the young of Notocirrus spiniferus. The relatively few known cases of lumbrinerid-like spp. living parasitically in other polychaetes and echiuroids are reviewed.

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