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The Crayfish

Note 39 — Chapter VI · THE DISTRIBUTION AND THE ÆTIOLOGY OF THE CRAYFISHES.

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See on this interesting subject: Martens, “On the occurrence of marine animal forms in fresh water.” Annals of Natural History, 1858: Lovèn. “Ueber einige im Wetter und Wener See gefundene Crustaceen.” Halle Zeitschrift für die Gesammten Wissenschaften, xix., 1862: G. O. Sars, “Histoire Naturelle des Crustacés d’eau douce de Norvège,” 1867.

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