Abstract
Six spp. of gastropod (Cerithium eburneum, C. litteratum, Columbella mercatoria, Astraea tecta, Tegula fasciata and Murex pomum) were marked individually and relocated on a rocky intertidal shelf in St. Thomas, USA Virgin Islands. Snails were relocated an average of 7.8 times. Extent of average daily movement varied significantly among species, from 56 cm in C. enburneum to 11 cm/day in Astraea tecta. Individuals of C. eburneum moved as groups. Extent of daily movement was unrelated to size within species and the patterns of movement seemed to function primarily to maintain snails within certain zones in the intertidal.