Chlamydia-like organisms in the digestive diverticula of the bay scallop, Argopecten irradians (Lmk)

. The morphology of a chlamydia‐like organism from the digestive diverticula of the bay scallop, Argopecten irradians (Lmk), is described. This organism was found in about 40% of bay scallops introduced to the quarantine unit at Ellerslie, Prince Edward Island, Canada and also in about 40% of the F1 and F2 generations. Procaryote infections were also found in the northern quahog, Mercenaria mercenaria (L.), the soft‐shelled clam, Mya arenaria L., and the Atlantic deepsea scallop, Placopecten magellanicus (Gmelin).