InhaltsangabePreface. Photographs and List of Participants. Genetic Variability in Littorina saxatilis from Different Habitats on an Island in Galway Bay; I.F. Wilson, E.M. Goslin. Electrophoretic Heterogeneity within and Between Flat Periwinkles (Mollusca: Gastropoda) Along an Intertidal Transect at Ria Ferrol, N.W. Spain; C.Olabarria, et al. A Preliminary Study on Genetic Differentiation in Littorina saxatilis from Galway Bay, Ireland: Littorina tenebrosa Montagu - a Valid Species or Ecotype? E.M. Gosling, et al. Lack of Significant Esterase and Myogolobin Differentiation in the Periwinkle, Littorina striata (Gastropoda, Prosobranchia); H. De Wolf, et al. A Comparison of Different Protocols for RAPD Analysis of Littorina; N. Mikhailova, K. Johanneson. Radular Myogolobin and Protein Variation Within and Among Some Littorinid Species (Mollusca: Gastropoda); R. Medeiros, et al. Allozyme Variation and Behavioural Dimorphism among Populations of Littorina brevicula (Philippi) from Japan; N.I. Zaslavskaya, Y. Takada. Sexual Selection and Assortative Mating by Size and Their Roles in the Maintenance of a Polymorphism in Swedish Littorina saxatilis Population; J. Erlandsson, E. Rola'n-Alvarez. Rough Periwinkle Polymorhism on the East Coast of Yorkshire: Comparison of RAPD-DNA Data with Morphotype; C.S. Wilding, et al. Assortative Mating Between Two Distict Micro-Allopatric Populations of Littorina saxatilis (Olivi) on the North-East Coast of England; S.L. Hull. Natural Selection on a Vertical Environmental Gradient in Littorina saxatilis: Analysis of Fecundity; R. Cruz, et al. Effects of Habitat on Growth and Shape of Contrasting Phenotypes of Bembicum vittatum Philippi in the Houtman Abrolhos Islands, Western Australia; M.S. Johnson, R. Black. Increasing Precision in Randomised Field Experiments: Barnacle Microtopography as a Predictor of Littorina Abundance; E.G. Boulding, F.M. Harper. Temporal Variation in Parasite Loading in Relation to Life History Patterns of Littoriana obtusata and L. fabalis; G.A. Williams, T.J. Brailsford. Gills and Size in Some Small Littorina; D.H. Black, et al. A Hot Summer, Cold Winters, and the Geographical Limit of Trochocochlea lineata in Somerset; J.H. Crothers. Density and Shell-Size Variation of Nododillitorina lineolata (Orbigny, 1840) in the Intertidal Region in South-East Brazil; C.A. De Magalhães. Spawning Periodicity of Three Species of Nodilittorina in Hong Kong; Y.M. Mak. What to When There is Nothing to Do: The Ecology of Jamaican Intertidal Littorinidae (Gastropoda: Prosbranchia) in Repose; R.C. Lang, et al. Seasonal Variation in Soluble Uric Acid Concentration in Littorina saxatilis (Olivi); D.C. Smith, T.P. Smith. Intersex and Littorina littorea in Cork Harbour: Results of a Medium-Term Monitoring Programme; J.D. Casey, et al. Imposex in Nucella lapillus and Intersex in Littorina littorea: Interspecific Comparison of Two TBT-Induced Effects and their Georgraphical Uniformity; J. Oehlmann, et al. Toxico-Kinetic and -Dynamic Aspects of TBR-Induced Imposed in Hydrobia ulvae Compared with Intersex in Littorina littorea (Gastropoda, Prosobranchia); U. Schulte-Oehlmann, et al. Ultrastructure of Prostate Gland Tissue in Males and Females with Intersex Phenomena of Littorina littorea L.; G. Sundermann, et al. Short Communications. Diet in Littoraria; J.T. Christensen. A N