Limpet movements were observed between surges at high tide. Homing was defined as leaving a specific place on the rock and then returning to the same location. There was 54% homing in A. digitalis and 76% homing in L. gigantea. Observation indicated that following a slime trail and recognition of rock topography were possible mechanisms of return. The rock surface around the home was cleaned with a wire brush to remove any slime trail. This had no effect on A. digitalis, indicating that this was not the mechanism. L. gigantea was repelled by the brushed area but there was no significant difference between control and experimental groups. Thus results were inconclusive. The rock surface around the home was chiseled to change the topography. A. digitalis was repelled on return trips. This indicated that recognition of rock topography was the mechanism of return in this species. The results of experiments with L. gigantea were inconclusive but other observations of behavior indicate that recognition of rock topography is a mechanism of return in this species.