About two years ago, while examining some sections of a Nereis (probably N. diversicolor, O. F. Müll.) which I had cut in the Zoological Laboratory at University College, London, I discovered an interesting organ, which appears to have hitherto escaped the notice of those naturalists who have studied the anatomy of the Nereids. Since then I have from time to time continued my observations, both in London and in the Oxford Museum, always hoping to be able to obtain the stages in the development of Nereis, the study of which alone can give a real clue to the homology and functions of these organs. This unfortunately has not been possible, owing chiefly to the fact that I have not been able to go myself to the sea-side to pursue my researches. It has therefore been thought advisable to publish the facts as they stand, and this paper amounts to little more than a mere description of this new organ. Some notes on the minute structure of the nephridium of the Nereids have also been added.
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Edwin S. Goodrich (1893) studied this question.