1. Hyman, L.H.: The Invertebrates, Vol. 5, p. 143. New York: McGraw-Hill 1959
2. Thomas, I.M., in: The Evolution of Living Organisms, p. 166 (ed. G.W. Leeper). Melbourne University Press 1962
3. Ashworth, R.B., Cormier, M.J.: Science155, 1558 (1967)
4. Collected at Kahala Beach, Oahu, May 20 and 21, 1974, and identified by M.G. Hadfield, University of Hawaii. We thank Prof. A.H. Banner for bringing this animal to our attention
5. Powers, J.C.: J. Org. Chem.31, 2627 (1966)