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Quantitative studies of the benthic invertebrates of the eastern Pacific Ocean have been limited geographically to Washington and California. In the Puget Sound region there were several earlier studies (Shelford, et al, 1935; Shelford and Towler, 1925; Weese, 1932; and Weese and MacNab, 1930). In San Francisco Bay, Packard (1918) studied the quantitative distribution of molluscans. Recently Filice (l958, 1959) and later Jones (1961) made quantitalive samples in certain areas of the bay. In the past decade there has been considerable interest in the quantitative descriptions of the animals of the sea bottom of southern California. The initial paper dealing with the off-shore fauna was by Hartman (l955a), and since that date many additional papers have appeared dealing with the distribution of species and descriptions of animal communities (Barnard and Hartman, 1959; Barnard, Hartman, and Jones 1959; Barnard and Ziesenhenne, 1961; Hartman, 1960; Hartman and Barnard, 1958, 1960). The benthic fauna of southern California bays and harbors has been studied with possible reference to pollution (Anon. l952a, b; Barnard, 1959: Reish, 1955, 1959b, 1959d, 1961; Reish and Winter, 1954).
Prior to the expeditions by the Beaudette Foundation to Bahía de San Quintín, no area south of California had been studied quantitatively. Accordingly, it was particularly interesting to participate in the study of this relatively undisturbed body of water lying within the same zoogeographic province as Southern California.
Eastern Pacific warm temperate to tropical