Abstract
IN Mr. B. B. Woodward's interesting letter on the occurrence of Pisidium Clessini in Loch Ness (NATURE, August 4, p. 715) he does not mention the depth at which his specimens were found. Loch Ness, in the deeper parts of which Pisidium has been dredged on more than one occasion, is a very deep lake in which different zones of life undoubtedly occur. In Lake Biwa, in Japan, the Palæarctic P. casertanum is found only at considerable depths (17–30 fathoms), and it is probable that in Scotland P. Clessini lives still deeper.
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ANNANDALE, N. The Fauna of Scottish Lochs. Nature 107, 778 (1921). https://doi.org/10.1038/107778b0
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DOI: https://doi.org/10.1038/107778b0
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