Ih' 
MANUAL 
OF THE 
LAND AND FDESH-WATED SHELLS 
OF 
THE BRITISH ISLANDS, 
WITH FIGURES OF EACH OF THE KINDS. 
BY 
WILLIAM TURTON, M.D. 
NEW EDITION, WITH ADDITIONS, 
BY 
JOHN EDWAED GEAT, Ph.D., E.E.S, 
F.L.S., F.E.G.S., Y.P.Z.S. & ENT. SOC., ETC. 
LONDON: 
LONGMAN, BLOWN, GEEEN, LONGMANS, AND EGBERTS. 
1857. 
