The coelomocytes of the terebellid polychaete Amphitrite johnstoni Malmgren are phagocytic and accumulate oil, glycogen, and β-carotene. They also contain haemoglobin, which is transformed to haematin by ageing cells. It is to haematin that the brown colour of some worms is due. The quantity of haemoglobin in the coelomocytes is about half that in the blood. The coelomocytes increase in number in summer during early growth of the gametes, and decrease before spawning. Measurement of the quantities of coelomocytes and of gametes, and quantitative determinations of oil and glycogen suggest that the principal function of the coelomocytes is the supply of nutrients for the gametes.

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