UNITED STATES 



!>1 



EXPLORING EXPEDITION 



DUKING THE YEARS 



1838, 1839, 1840, 1841, 1842. 



UNDER THE COMMAND OF 



CHARLES WILKES, U. S. N. 



ATLAS. 



ZOOPHYTES. 



BY 



JAMES D. DANA, A. M., 



GEOLOGIST OP THE EXPEDITION, 



MEMBER OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES OF BOSTON, 

 ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA, ETC. 



PHILADELPHIA: 

 LEA AND BLANC HARD. 

 1849. 



