1. B. Franco, M. Tsurnamal, A. Colorni and S. Halevy. in preparation.
2. Prianos sp. of the familyHymeniacidonidae, identified by Dr M. Tzurnamal of the Zoology Department, Hebrew University of Jerusalem.
3. W.C. Still, M. Kahn and A. Mitra, J. org. Chem.43, 2923 (1978).
4. Y. Kashman and M. Rotem, Tetrahedron Lett.1979, 1707.
5. S. Sokoloff, I. Tamir, S. Halevy and S. Sarel, submitted.