(Number 1)

M.C. Davey - The relationship between size, density and sinking velocity through the life cycle of Melosira granulata (Bacillariophyta) (pp 1-18); R.J. Flower - An evaluation of some early diatom material and chemical data from Lough Neagh, Northern Ireland (pp 19-26); H. Håkansson - An investigation of the morphology of Stephanodiscus transilvanicus Pantocsek (pp. 27-31); H. Håkansson - A study of the Discoplea species (Bacillariophyceae) described by Ehrenberg (pp. 33-56); G.M. Hallegraeff - Taxonomy and morphology of the marine plankton diatoms Thalassionema and Thalassiothrix (pp. 57-80); C.S. Lobban - A new frond-forming colonial Navicula from the Antarctic (pp. 81-87); T.B.B. Paddock - Observations on the genus Stauropsis Meunier and related species (pp. 89-98); M. Poulin, L. Berard-Therriault & A. Cardinal - Fragilaria and Synedra (Bacillariophyceae): a morphological and ultrastructural approach (pp. 99-112); J.R. Rosowski, S.C. Roemer, J. Palmer & K.D. Hoagland - Extracellular association and adaptive significance of the bas-relief mucilage pad of Achnanthes lanceolata (Bacillariophyceae) (pp. 113-129); D.M. Williams - Comparative morphology of some species of Synedra Ehrenb. with a new definition of the genus (pp. 131-152).

(Number 2)

A.E. Bailey-Watts - The ecology of planktonic diatoms, especially Fragilaria crotonensis, associated with artificial mixing of a small Scottish loch in summer (pp 153-168); W.H. Kim & J.A. Barron - Diatom biostratigraphy of the Upper Oligocene to Lowermost Miocene San Gregorio Formation, Baja California Sur, Mexico (pp. 169-187); J.P. Kociolek - Determining character polarity in diatoms: an alternative approach (pp. 189-192); D.G. Mann - Methods of sexual reproduction in Nitzschia: systematic and evolutionary implications (Notes for a monograph of the Bacillariaceae 3) (pp. 193-203); L.K. Medlin & F.E. Round - Taxonomic studies of marine gomphonemoid diatoms (pp 205-225); D.M. Paterson - The migratory behaviour of diatom assemblages in a laboratory tidal micro-ecosystem examined by low temperature scanning electron microscopy (pp 227-239); P.A. Sims - Sphynctolethus Hanna, Ailuretta gen. nov. and evolutionary trends within the Hemiauloideae (pp. 241-269); A.J. Stickle - Mastogloia smithii has a method of sexual reproduction hitherto unknown in raphid diatoms (pp. 271-282); K. Sündback & L.K. Medlin - A light and electron microscopic study of the epipsammic diatom Catenula adhaerens Mereschkowsky (pp. 283-290); T.P. Watkins & G.A. Fryxell - Generic characterisation of Actinocyclus: consideration in light of three new species (pp. 291-312); D.M. Williams & F.E. Round - Revision of the genus Synedra Ehrenb. (pp. 313-339).

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