p. 27-58 DONNES QUALITATIVES ET QUANTITATIVES SUR LE MICROPHYTOBENTHOS DES FONDS SABLONNEUX ET VASEUX DU LITTORAL ROUMAIN DE LA MER NOIRE N. Bodeanu Institut Roumain de Recherches Marines - Constanta Abstract The systematic composition of the mobile microbenthic sediments are analysed as well as the participation of plankton to building the former, the composition of benthic microfila per ecological groups and the most frequent and quantitatively main species. Data are given regarding the quantitative distribution of microphyto- benthos depending on the underlyng layers and depth, at various times ,the annual density dynamics and average monthly biomass, the average yearly values and overall stock of benthic microflora in the area investigated. The paper also describes the equipment of original con- struction used for collecting quantitative samples.