(Number 1).

G.W. Andrews & P. Rivera - Morphology and evolutionary significance of Adoneis pacifica gen. et sp. nov. (Fragilariaceae, Bacillariophyta), a marine araphid diatom from Chile (pp. 1-14); H. Håkansson & A. Ehrlich - Stephanodiscus galileensis sp. nov. from Holocene subsurface sediments of Lake Kinneret, Israel (pp. 15-21); N.I. Hendey & P.A. Sims - Examination of some fossil eupodiscoid diatoms with descriptions of two new species of Craspedoporus Greville (pp. 23-34); B. Hickel & H. Håkansson - Dimorphism in Cyclostephanos dubius (Bacillariophyta) and the morphology of initial valves (pp. 35-46); P.M. Houpt - Observations on the marine tube-dwelling diatom Navicula pseudocomoides in culture (pp. 47-53); R. Klee & R. Schmidt - Eutrophication of Mondsee (Upper Austria) as indicated by the diatom stratigraphy of a sediment core (pp. 55-76); K. Krammer & H. Lange-Bertalot - Morphology and taxonomy of Surirella ovalis and related taxa (pp. 77-95); D.G. Mann - Sexual reproduction in Cymatopleura (pp. 97-112); E.F. Stoermer, J.P. Kociolek, C.L. Schelske & D.J. Conley - Quantitative analysis of siliceous microfossils in the sediments of Lake Erie’s Central Basin (pp. 113-134).

(Number 2)

E.J. Cox - Placoneis Mereschkowsky: The re-evaluation of a diatom genus originally characterized by its chloroplast type (pp. 145-157); E.J. Cox - Studies on the diatom genus Navicula Bory. VI. The identity, structure and ecology of some freshwater species (pp. 159-174); G.R. Hasle & H.J. Semina - The marine planktonic diatoms Thalassiothrix longissima and Thalassiothrix antarctica with comments on Thalassionema spp. and Synedra reinboldii (pp. 175-192); K. Lee & F.E. Round - Studies on freshwater Amphora species. 1. Amphora ovalis (pp. 193-203); D. Marino, M. Montresor & A. Zingone - Miraltia throndsenii gen. nov., sp. nov., a planktonic diatom from the Gulf of Naples (pp. 205-211); G. Novarino - A note on the internal construction of the partectal ring of Mastogloia lanceolata (pp. 213-217); F.M.H. Reid & F.E. Round - The Antarctic diatom Synedra reinboldii: taxonomy, ecology and transference to a new genus, Trichotoxon (pp. 219-227); P.A. Sims & G.R. Hasle - Two Cretaceous Stellarima species: S. steinyi and S. distincta; their morphology, palaeogeography and phylogeny (pp. 229-240); K. Sundbäck - The epipsammic marine diatom Opephora olsenii Möller (pp. 241-249); E. Theriot, E. Stoermer & H. Håkansson - Taxonomic interpretation of the rimoportula of freshwater genera in the centric diatom family Thalassiosiraceae (pp. 251-265); D.M. Williams & F.E. Round - Revision of the genus Fragilaria (pp. 267-288). Obituary - Hans-Adolf von Stosch 1908-1987 (pp. 289-294).