THE MORPHOLOGY AND TAXONOMY OF THE MARINE CENTRIC DIATOM GENUSPARALIA.II.PARALIA CRENULATA, P. FAUSTAAND THE NEW SPECIES,P. HENDEYI

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Abstract
Details of the morphology of three fossil species of the marine diatom genus Paralia are presented. Those of P. thybergii Stabell are added in order to distinguish it from P. crenulata (Grun.) Gleser which is illustrated from well-preserved material. Melosira fausta A Schmidt is newly combined with Paralia and illustrated for the first time with SEM; P. hendeyi Sims & Crawford is descibed as new. All are compared with each other, with the fossil species P. siberica (A. Schmidt) Crawford & Sims and with the only extant member of the genus, P. sulcata (Ehrenb.) Cleve.