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A
MONOGRAPH
OF
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.
• 115392-D