1. Arey, L. B. and W. J. Crozier: The sensory responses of Chiton. J. exp. Zool. 29, 157?260 (1919)
2. Batschelet, E. B.: Circular statistics in biology, 371 pp. London: Academic Press 1981
3. Chelazzi, G.: Zonazione dinamica e meccanismi di orientamento nei molluschi litorali. Atti Accad. Fisiocr. 52, 275?293 (1980)
4. Chelazzi, G.: Behavioural adaptation of the gastropod Nerita polita L. on different shores at Aldabra Atoll. Proc. R. Soc. Lond. B215, 451?467 (1982)
5. Chelazzi, G., S. Focardi, J. L. Deneubourg and R. Innocenti: Competition for the home and aggressive behaviour in the chiton Acanthopleura gemmata (Blainville) (Mollusca: Polyplacophora) (In preparation)