MARINE ENVIRONMENTS. The Significance of Trace Metal Concentrations in Marine Invertebrates (Philip Rainbow). Cadmium Bioaccumulation in the Scallop Mizuhopecten yessoensis from an Unpolluted Environment (O.N. Lukyanova, N.N. Belcheva, V.P. Chelomin). Accumulation and Subcellular Distribution of Metals in the Marine Gastropod Nassarius reticulatus L. (T. Kaland, T. Andersen, K. Hylland). Metallothionein in Marine Molluscs (E. Carpene). Metal Concentrations in Antarctic Crustacea: The problem of Background Levels (G.P. Zauke, G. Petri). Effects of Cadmium on Survival, Biocaccumulation, Histopathology, and PGM Polymorphism in the Marine Isopod Idotea Baltica (M. de Nicola, N. Cardellicchio, C. Gambardella, S.M. Guarino, C. Marra). FRESHWATER ENVIRONMENTS. Metal Uptake, Regulation, and Excretion in Freshwater Invertebrates (Philip Rainbow and R. Dallinger). Accumulation and Effects of Trace Metals in Freshwater Invertebrates (K. R. Timmermans). Investigation of Uranium-Induced Toxicity in Freshwater Hydra (R.V. Hyne, G. D. Rippon, G. Ellender). Metal Regulation in Two Species of Freshwater Bivalves (M.H.S. Kraak, M. Toussaint, E.A.J. Bleeker, D. Lavy). Autoradiographic Study of Zinc in Gammarus pulex (Amphipoda) (Q. Xu). The Use of Freshwater Invertebrates for the Assessment of Metal Pollution in Urban Receiving Waters (R.R.F. Shutes, J.B. Ellis, A.D. Bascombe).Evolution of Resistance and Changes in Community-Composition in Metal-Polluted Environments: A Case-Study on Foundry Cove (P.L. Kierks and J. S. Levinton). TERRESTRIAL ENVIRONMENTS. Strategies of Metal Detoxification in Terrestrial Invertebrates (R. Dallinger). Budgeting the Flow of Cadmium and Zinc through the Terrestrial Gastropod, Helix pomatia L. (B. Berger, R. Dallinger, E. Felder, J. Moser). Quantitative Aspects of Zinc and Cadmium Binding in Helix pomatia: Differences between an Essential and a Non-Essential Trace Element (R. Dallinger, B. Berger, A. Gruber). Metal Relationships of Earthworms (A. J. Morgan, J. E. Morgan, M. Turner, C. Winter, A. Yarwood). Deficiency and Excess of Copper in Terrestrial Isopods (S. P. Hopkin). Metal Contamination Affects Size-Structure and Life-History Dynamics in Isopod Field Populations (M. H. Donker, H. E. van Capelleveen, N. M. van Straalen). Metal Bioaccumulation in a Host Insect (Lymantria disper L., Lepidoptera) During Development - Ecotoxicological Implications (J. Ortel, S. Gintenreiter, H. Nopp). Soil and Sediment Quality Criteria Derived from Invertebrate Toxicity Data (N. M. van Straalen).