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In a previous paper, (Shelton, 1974) it was shown that the antennules and some other appendages of certain field and laboratory populations of the brown shrimp,Crangon crangon(L.), may become colonized by a filamentous organism tentatively identified as a blue-green alga. Other workers (Johnsonet al., 1971) have described similar growths on benthic Crustacea, fish eggs and algae (Bland & Brock, 1973) and have identified the epizooic organism asLeucothrix mucorOersted (Harold & Stanier, 1955), a filamentous, heterotrophic bacterium, common in the intertidal zone.