EN
Comparison of quantitative samples taken in consecutive seasons of the year in a forest malacocenosis in SW Poland revealed considerable changes in the snail density per unit area; the structure of the malacocenosis remained roughly constant throughout the year. Acicula polita (Hartm.), Columella edentula (Drap.), Discus perspectivus (Mühlf.), Alinda biplicata (Mont.) and Helicodonta obvoluta (O. F. Müll.) show aggregated distribution only during a part of the year.