1. S. Dijkgraaf, Biol. Rev.38, 51 (1963).
2. S. Dijkgraaf, Z. vgl. Physiol.27, 587 (1940).
3. S. Dijkgraaf, Exper.8, 205 (1952).
4. M. J. Cohen andS. Dijkgraaf, inThe Physiology of Crustacea (Academic Press, New York 1961), vol. 2.
5. E. E. Suckling andJ. A. Suckling, J. Acoust. Soc. Am., in press.