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FOUR FIGURESI n a recent paper on the influence of temperature, food supply, sex and age on the rate of growth of this species, it was shown that on the coast of Southern California the mu+ sel under favorable conditions may reach a length of 80 to 86 mm. at the age of 1 year, 120 mm. when 2 years old and approximately 145 mm. at the end of the third year (Coe and Fox, '42). The habitat, food, digestion and salinity require- It now remains to consider some of the substances of which the body and shell of the mussel are composed, the amounts and sources of the materials which have contributed to the growth of the tissues and the deposition of the shell as well as the various ways in which the metabolism of the mussel affeds the associated organisms in the vicinity.

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The object of this study was to determine in a species of marine bivalve living under natural conditions the influence of the available food plankton and temperature on the rate of growth at different ages and at all seasons of the year. F o r such an investigation the pier at the Scripps Institution of Oceanography is particularly favorable because daily records are taken there of the physical and biological conditions of the water 2. It is also favorable because the piles of the pier support a vigorous natural growth of this species of mussel.With the exception of an abstract published by ourselves (Coe and Fox, '41) only a single reference to the observed rate of growth of living individuals of this species has been found and that mentions only the size attained at the age of one year (Scofield, '17). The observations herein reported

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