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Collections from sand beaches and coastal waters of Chios included seven species of Eurydice, of which E. longispina is new to science. A full description of E. czerniavsky is also given, with brief descriptive notes of other little known species and discussions of their systematic positions. Qualitative sampling revealed that E. czerniavsky and E. pontica were restricted to exposed beaches, whilst E. longispina and E. rotundicauda favoured a more sheltered shore. The genus extended from the intertidal zone to offshore waters with individual species showing characteristically limited ranges according to the depth of water over which they were found, E. pontica being limited to the water’s edge, E. dollfusi extending to depths of 1 or 2 m, E. spinigera from about 1 to 10 m and E.inermis over 10 m. The ecology and geographical distribution of these species is discussed in relation to the work of other authors in the Mediterranean and Black Sea.