Fen malacocenoses in Dovrefjell (S. Norway)

The Malacofauna of 37 topogenous, soligenous and mixed fens in Dovrefjell consists of 18 snail species and 3 slugs, with 1 – l0 species per locality and 5 - 358 individuals per 10 1 litter; at most localities single species dominate strongly. The number of species and individuals and the dominance structure of the malacocenoses depend on the fen type, litter pH and Ca content, and altitude. Two of the four records of Vertigo parcedentata (Al. Braun) are new.