In shell middens bones and shells are surviving indicators of the diet of the former inhabitants. Unless carbonized, the plants consumed leave no obvious trace.A comparison of Californian and Fijian (Viti Levu Island) shellmounds reveals a striking similarity in the quantity of bone and an even more striking dissimilarity in the quantity of shell. In both areas bone constitutes less than onehalf of one per cent of the weight of the mound mass. In Fiji shell constitutes on the average 13 per cent by weight, whereas the average in California is 52 per cent—four times as great. The following speculations are based on these facts.