p. 43 - 62 DONNEES CONCERNANT LA FLORAISON DES EAUX DU LITTORAL ROUMAIN DE LA MER NOIRE AVEC LE PERIDINIEN EXUVIAELLA CORDATA OSTF. Nicolae Bodeanu et Anca Roban Institut Roumain de Recherches Marines Constantza Abstract This paper concerns the Exuviaella cordata "blooming" during the summer of the years 1974 and 1975, in the waters of the Black Sea along the Romanian shores. There are analysed the factors concur- rent to the apparition of this phenomenon, its immediate effects, including the mass mortality of marine animals which occured.