EXPEDITION SHELLS; 



DESCRIBED FOR THE WORK OF THE 



UNITED STATES EXPLORING EXPEDITION 



COMMANDED BY CHARLES WILKES, U. S. N., 

 DURING THE YEARS 1S38— 1S42. 



SHELLS 



OF THE 



NORTH PACIFIC EXPLORING EXPEDITION 



UNDER COMMANDERS RINGGOLD AND RODGERS. 



COLLECTANEA: 



DESCRIPTIONS OF SHELLS AND MOLLUSKS, 



EEPRINTED FROM VARIOUS SCIENTIFIC PERIODICALS, 

 WITH REVISIONS. 



RECTIFICATIONS. 



