The Cambridge natural history, Vol. 03 (of 10)Note 63 — Chapter II · LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMYReading editionJ. S. Gibbons, Quart. Journ. Conch. ii. p. 143.◇Copy noteReturn to CHAPTER II LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMY