Three new varieties and two new combinations of marine Cryptophyceae are described:Proteomonas pseudobalticacomb, nov.,P. pseudobalticavar.leonardianavar. nov.,Pyrenomonas salinavar.curvatavar. nov.,Rhinomonas reticulatavar.atroroseacomb, et stat. nov., andR. reticulatavar.compressavar. nov.Proteomonasis compared to the freshwaterCryptomonas marssonii.Planktonic specimens collected from the southern North Sea during the NERC North Sea Project 1988/89, tentatively identified asCryptomonas acutaandPlagioselmissp., are also examined. Characters having taxonomic significance at various levels include cell compression, periplast features, chloroplast number, nucleomorph position, and phycoerythrin type. Comments are made on cell shrinkage occuring during preparation for scanning electron microscopy (up to about 23%). The appearance af trie vestibular region from which the flagella emerge is also discussed. It is suggested that the term ‘furrow’ may encompass a variety of structures. Of these, only one appears to be non‐artefactual; this seems to be taxonomically significant at most at the species
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