1. Arvanitaki, A., and Chalazonitis, N., Bull. Inst. Oceanog. (Monaco), 1 (1961).
2. Waziri, R., Frazier, W., and Kandel, E. R., Physiologist, 8, 300 (1965).
3. Strumwasser, F., in Wierzma, C. A. G. (ed)., Invertebrate Nervous Systems, 291 (University of Chicago Press, Chicago, 1967).
4. Carpenter, D. O., and Gunn, R., J. Cell. Physiol., 75, 121 (1970).
5. Mathieu, P. A., and Roberge, F. A., Can. J. physiol. Pharm., 49, 787 (1971).