ll data for clams were available in 1967, but the maximum value for 6060 in the edible portion of clams in 1964 was 73 pCi/g wet (Bonham, 1967). The land crabs are listed separately for Bikini I. and Enyu I. because the panel convened by the DBM in 1968 recommended, ‘the basis of the data then available, omitted from the Bikini diet. on that coconut crabs be Thirteen crabs collected at Enyu I. in 1969 were analyzed for 905, and gamma emitters; the levels of all radionuclides are sufficiently low that a reconsideration of the restriction for Enyu I. is indicated. The species of birds are listed separately for 1969 because an average value for all birds would be a poor estimate of the potential intake, In general, since few curlews or turnstones are available. there are no striking differences between the 1967 and 1969 average values of radionuclides for edible portions of foods of marine origin, including the sea birds. The dif- ferences tend to show a decline in radionuclide content in 1969, but there are not sufficient data to provide a basis for a reasonable estimate of rates of decline because of the large variability in the data and the many poorly defined factors involved in the uptake and retention of radionuclides by organisms in the natural environment of Bikini. Some basic biologi- cal information such as rates of growth and life spans of the