Distributions of nine new or little-known exotic land snails in British Columbia

Introduced species of terrestrial molluscs of British Columbia were collect ed between 1989 and 1998. New locality records and expanded distributions a re documented for seven introduced land snails: Lauria cylindracea (Chrysal is Snail), Vallonia pulchella (Lovely Vallonia), Oxychilus alliarius (Garli c Glass-snail), O. cellarius (Cellar Glass-snail), O. draparnaudi (Dark-bod ied Glass-snail), Cepaea nemoralis (Grovesnail) and Helix aspersa (Brown Ga rdensnail). Two other species, Vallonia excentrica (Iroquois Vallonia), and Vitrea contracta (Contracted Glass-snail) are reported from British Columb ia for the first time. About 25% of the terrestrial molluse species in the province are exotic. Mechanisms of introduction include transport on nurser y plants and on salvaged bricks. Potential impacts on native fauna include predation by Oxychilus.