The Cambridge natural history, Vol. 03 (of 10)Note 52 — Chapter II · LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMYReading editionZoologist, iv. p. 1504; iii. p. 1038; iii. p. 943.◇Copy noteReturn to CHAPTER II LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMY