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THE INTERNATIONAL SCIENTIFIC SERIES.

THE

CRAYFISH. AN INTB OB NOTION TO THE STUB Y OF ZOOLOGY.

BY

T. H. HUXLEY, F. R. S.

WITH EIGHTY-TWO ILLUSTRATIONS.

HEW YORK: D. APPLETON AND COMPANY, 1, 3,

and

5 BOND STREET.

1880.