■J / - 



THE INTERNATIONAL SCIENTIFIC SERIES. 



THE 



CRAYFISH. 



AJV^ IJSTTE OD UCTION TO THE STUB Y OF 



ZOOLOGY. 



BY 



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



WITH EIGHTY-TWO ILLUSTRATIONS. 



NEW YORK: 



D. APPLETON ANTD COMPANY, 



1, 3, AND 5 BOND STREET. 



1880. 



