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LII. PHYSICAL EXPRESSION : its Modes and Principles. By FRANCIS WARNER, M.D., F.R.C.P. Second Edition. With 50 Illustrations. LIII. ANTHROPOID APES. By ROBERT HARTMANN. With

63 Illustrations. Second Edition.

LIV. THE MAMMALIA IN THEIR RELATION TO
PRIMEVAL TIMES. By OSCAR SCHMIDT. With 51 Woodcuts.
LV. COMPARATIVE LITERATURE. By H. MACAULAY
POSNETT, LL.D.

LVI. EARTHQUAKES and other EARTH MOVEMENTS.
By Prof. JOHN MILNE. With 38 Figures. Third Edition.

LVII. MICROBES, FERMENTS, and MOULDS. By E. L.

TROUESSART. With 107 Illustrations. Second Edition.

LVIII. GEOGRAPHICAL and GEOLOGICAL DISTRIBU. TION of ANIMALS. By Prof. A. HEILPRIN.

LIX. WEATHER: a Popular Exposition of the Nature of Weather Changes from Day to Day. By the Hon. RALPH ABERCROMBY. With 96 Figures. Third Edition.

LX. ANIMAL MAGNETISM. By ALFRED BINET and CHARLES
FÉRE. Third Edition.

LXI. MANUAL OF BRITISH DISCOMYCETES, with descrip-
tions of all the Species of Fungi hitherto found in Britain included in the
Family, and Illustrations of the Genera. By WILLIAM PHILLIPS, F.L.S.
LXII. INTERNATIONAL LAW. With Materials for a Code of
International Law. By Professor LEONE LEVI.

LXIII. The GEOLOGICAL HISTORY of PLANTS. By Sir J. WILLIAM DAWSON. With 80 Illustrations.

LXIV. THE ORIGIN OF FLORAL STRUCTURES THROUGH INSECT AND OTHER AGENCIES. By Prof. G. HENSLOW. LXV. On the SENSES, INSTINCTS, and INTELLIGENCE of ANIMALS, with special reference to INSECTS. By Sir JOHN LUBBOCK, Bart., M.P. With 118 Illustrations. Third Edition. LXVI. THE PRIMITIVE FAMILY IN ITS ORIGIN AND DEVELOPMENT. By C. N. STARCKE.

LXVII. PHYSIOLOGY of BODILY EXERCISE. By FERNAND LAGRANGE, M.D. Second Edition.

LXVIII. The COLOURS of ANIMALS: their Meaning and Use, especially considered in the case of Insects. By E. B. POULTON, F.R.S. With Chromolithographic Frontispiece and upwards of 60 Figures in Text. Second Edition.

LXIX. INTRODUCTION TO FRESH-WATER ALGA. With an Enumeration of all the British Species. By M. C. COOKE, LL.D. With 13 Plates Illustrating all the Genera.

LXX. SOCIALISM: NEW AND OLD. By WILLIAM GRAHAM, M.A., Professor of Political Economy and Jurisprudence, Queen's College, Belfast. Second Edition.

LXXI. COLOUR-BLINDNESS AND COLOUR-PERCEPTION. By F. W. EDRIDGE-GREEN, M.D. With 3 Coloured Plates.

LXXII. MAN AND THE GLACIAL PERIOD. By G. F. WRIGHT, D.D. With 111 Illustrations and Maps.

LXXIII. HANDBOOK OF GREEK AND LATIN PALEOGRAPHY. By E. MAUNDE THOMPSON. With Tables of Alphabets and Facsimiles.

London: KEGAN PAUL, TRENCH, TRÜBNER, & CO., LTD.

INTERNATIONAL SCIENTIFIC SERIES

VOL. LXXV.

THE

DISPERSAL OF SHELLS

AN INQUIRY INTO THE MEANS OF DISPERSAL POSSESSED BY FRESH-WATER AND LAND MOLLUSCA

BY

HARRY WALLIS KEW, F.Z.S.

WITH A PREFACE BY

ALFRED RUSSEL WALLACE, LL.D., F.R.S., ETC.

WITH ILLUSTRATIONS.

LONDON

KEGAN PAUL, TRENCH, TRÜBNER & CO., LTD.

PATERNOSTER HOUSE, CHARING CROSS ROAD

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