SOME few years ago, much interest was excited amongst naturalists by the announcement of the occurrence, in the great Swedish lakes Venner and Vetter, of certain Crustacea, heretofore known only as marine species inhabiting the Arctic and Baltic Seas, The author of this discovery was Professor Lovèn; and the explanation of it appeared to be, that the gradual elevation of the Scandinavian peninsula had cut off these originally marine creatures from their natural habitat, and that they had been able to accommodate themselves successfully to altered conditions of life.
Histoire Naturelle des Crustacés d'eau douce de Norvège;
by George Ossian Sars. Part I. Malacostraca. With 10 plates. (Christiania, 1867.)
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B., G. Histoire Naturelle des Crustacés d'eau douce de Norvège . Nature 1, 455 (1870). https://doi.org/10.1038/001455a0