Abstract
The ostracod fauna of intertidal Corallina officinalis L. from western Norway comprised 14 species. Four of these, Elofsonella concinna (Jones), Semicytherura nigrescens (Baird), Xestoleberis dcpressa Sars, and Paradoxostoma pulchellum Sars, were permanent inhabitants of the alga, reproducing in it. Two of the species, Semicytherura inconspicua (Klie) and Xestoleberis pusilla Elofson, are new to Norway.