The Cambridge natural history, Vol. 03 (of 10)Note 72 — Chapter II · LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMYReading editionAnn. Mag. Nat. Hist. (5) xvi. p. 519.◇Copy noteReturn to CHAPTER II LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMY