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Journal Article On the Marine Mollusca of Madeira; with Descriptions of Thirty-five new Species, and an Index-List of all the known Sea-dwelling Species of that Island. Get access Robert Boog Watson, LL.D., F.R.S.E., F.L.S. Robert Boog Watson, LL.D., F.R.S.E., F.L.S. Search for other works by this author on: Oxford Academic Google Scholar Zoological Journal of the Linnean Society, Volume 26, Issue 168, November 1897, Pages 233–329, https://doi.org/10.1111/j.1096-3642.1897.tb00033.x Published: 23 December 2008
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Robert Boog Watson (1897) studied this question.
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