The Cambridge natural history, Vol. 03 (of 10)Note 79 — Chapter II · LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMYReading editionAnn. Mag. Nat. Hist. (2) vi. (1850) p. 68.◇Copy noteReturn to CHAPTER II LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMY