Sowerby, G. B. III. (1915). Descriptions of five new species of Mollusca of the genera Drillia, Marginella, Apicalia, Plesiotrochus, and Ringicula, all from Ceylon; also notes on the genus Plesiotrochus. Proceedings of the Malacological Society of London. 11 (4): 213–216. (29 March).
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Sowerby, G. B. III
1915
Descriptions of five new species of Mollusca of the genera <i>Drillia, Marginella, Apicalia, Plesiotrochus</i>, and <i>Ringicula</i>, all from Ceylon; also notes on the genus <i>Plesiotrochus</i>
Proceedings of the Malacological Society of London