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A

MONOGRAPH

or

THE FRESH-WATER POLYZOA,

INCLUDING

ALL THE KNOWN SPECIES,

BOTH BRITISH AND FOREIGN.

BY

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

REGIUS PROFESSOR OK NATURAL HISTORY IN THE UNIVERSITY OF EDINBURGH.

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