The Cambridge natural history, Vol. 03 (of 10)Note 37 — Chapter II · LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMYReading editionVon Martens, SB. Nat. Fr. Berl. 1881, p. 34.◇Copy noteReturn to CHAPTER II LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMY