Irrigation in the sipunculidPhascolion strombi(Mont.)

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Abstract
The species irrigates its habitation by muscular means. The frequency of irrigation waves, the volume of water transported per wave and the capacity of irrigation per gram per hour are calculated from kymograph recordings. Two types of irrigation (continuous and discontinuous) are distinguished. The total irrigation is estimated at 15 ml/g/h at temperatures between 15.0 and 22.2°C. Generation of over- and under-pressures in P. strombi connected with a vertical capillary is described. The experiments demonstrate that an eventual resistance yielded by the sediment may be overcome by the sipunculid. A decapitated specimen was studied for thirteen days during which period the irrigation was continuous. The significance of the irrigation is discussed. The irrigation was found mainly to serve a respiratory purpose.

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