EXPEDITION SHELLS; 



DESCRIBED FOR THE WORK OF THE 



UNITED STATES EXPLORING EXPEDITION 



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



DURING T1IK YEARS 1838—1842. 



SHELLS 



OF THB 



NORTH PACIFIC EXPLORING EXPEDITION 

 UNDER COMMANDERS RINGGOLD AND RODGERS. 



COLLECTANEA: 



DESCRIPTIONS OF SHELLS AND MOLLUSKS, 



BEPRES IKD FROM VARIOUS SCIENTIFIC PERIODICALS, 

 WITH REVISIONS. 



HECTIFICATIONS. 



