EXPEDITION SHELLS: 



DESCRIBED FOR THE WORK OF THE 



UNITED STATES EXPLORING EXPEDITION, 



COMMANDED BY CHARLES WILKES, U. S. N. 



DURING THE YEARS 1838-1842. 



By AUGUSTUS A. GOULD, M. D. 



[FROM THE " PROCEEDINGS OF THE BOSTON SOCIETY OF NATURAL HISTORY."] 



BOSTON: 



PRINTED BY FREEMAN AND BOLLES. 

 1846. 



