Abstract
The nereid polychaete Ceratonereis tridentata has been found occupying mudblisters in the calico scallop, Aequipecten gibbus, from off North Carolina. Characteristic Ceratonereis blisters were found in 24% of live scallops examined. These blisters can be distinguished easily from those of Polydora websteri by their larger size and often by their location in the scallop shell. Blister cavities may communicate with the mantle cavity or with the exterior. Anomalous malformations of the gills and the gonadal mass often accompany blisters having munication with the scallop mantle cavity. Ceratonereis tridentata is a facultative parasite of this scallop, also occurring among the epifauna of its shell.
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