The Cambridge natural history, Vol. 03 (of 10)Note 51 — Chapter II · LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMYReading editionSci. Trans. R. Dubl. Soc. (2) iv. p. 520.◇Copy noteReturn to CHAPTER II LAND AND FRESH-WATER MOLLUSCA, THEIR HABITS AND GENERAL ECONOMY