Some 92 terrestrial gastropods, representing 2 orders and 19 families, have been reported from Maine. These animals consist of 76 species of snails (16 families) and 16 species of slugs (3 families). The taxonomic status of two of the snails is questionable. Twelve species and varieties of snails have their type localities in Maine. Four of the snails and 11 of the slugs were introduced into Maine from Europe. An additional 21 species are apparently native to both Maine and Europe. Sixty-three terrestrial gastropods have been collected in Cumberland County alone, followed by Aroostook County with 57 species. Four snails have been reported from all 16 of Maine's counties: Strobilops labyrinthicus, Discus whitneyi, Novisuccinea ovalis, and Zonitoides arboreus.