Contributors.
General Preface.
Preface.
Contents of Other Volumes.
Prosobranches, V. Fretter.
Land Snails (Stylommatophora), A.S. Tompa.
Freshwater Snails (Basommatophora), W.P.M. Geraerts and J. Joose.
Opisthobranchs, M.G. Hadfield and M. Switzer-Dunlap.
Bivalves, G.L. Mackie.
Cephalopods, J.M. Arnold.
Index to Scientific Names.
Subject Index.