REFERENCE crater itself. The isolated pockets of turbid water suggested that the crater, even at this time, was still shifting by material flowing 1. ‘Mike Shot Cursory Report,”’ edited by W. E. Ogle and J. H. Lofland, Jr., Appendix A, Los through fissurés*throughthe coral sheath as Alamos Scientific Laboratory, November 1952 (not available). suggested in Sec. 1.3. page Il dobsted. 10