ABSTRACT: Malacoceonoses of alder carrs in 20 localities in central Wielkopolska, on the Warta River, were composed of 46 species of terrestrial gastropods. The density ranged from 16 to 828 indiv./m, the species diversity (H) from 1.48 to 3.75. In the summer in litter the most frequent and most abundant species were Carychium minimum, Perforatella incarnata, Zonitoides nitidus, Nesovitrea hammonis, Cochlicopa lubrica and Discus rotundatus. The following species are common to alder forests of Poland (Chodzie? Region, boundary of Wielkopolska, Silesia and Cracow-Wielun Jura, Kaczawskie Mts, banks of the Smolnica River in the Notecka Forest and central Wielkopolska): C. minimum, Succinea putris, S. oblonga, C. lubrica, Euconulus fulvus, Punctum pygmaeum, Vitrea crystallina, Aegopinella pura and Arion circumscriptus.