The ciliary currents in the mantle cavity of the Heteropod, Oxygyrus, were examined in the intact animal. The presence of three sets of currents concerned with the rejection of sediment, already postulated from examination, after dissection, of the mantle cavity in other Prosobranchs, was confirmed. The great majority of the sediment brought in with the respiratory current impinges on the line of the osphradium. This favours the conclusion that this organ is tactile in function and not a ehemoreceptor. The extent to which the organs and currents in the mantle cavity are modified as a result of pelagic life is discussed.

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