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A

MONOGRAPH

ОР

THE FRESH-WATER POLYZO A,

INCLUDING

ALL THE KNOWN SPECIES,

BOTH BRITISH AND FOREIGN.

BY

GEORGE JAMES ALLMAN, M.D., F.R.C.S.I., F.R.S., F.R.S.E., M.R.I.A.,

REGIUS PROFESSOR OF NATURAL HISTORY IN THE UNIVERSITY OF EDINBURGH.

LONDON:

PRINTED FOR THE RAY SOCIETY.

MDCCCLVI.

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