UNITED STATES 
EXPLORING EXPEDITION. 
DURING THE YEARS 
1838, 1889, 1840, 1841, 1842, 
UNDER THE COMMAND OF 
CHARLES VV LLERS sn 
VA 
ATLAS. 
MOLLUSCA AND SHELLS. 
BY 
7 
AUGUSTUS A. GOULD, M.D, 
FELLOW OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES; AND OF THE AMERICAN PHILOSOPHICAL SOCIETY ; 
MEMBER OF THE ACADEMY OF NATURAL SCIENCES AT PHILADELPHIA; OF THE 
BOSTON SOCIETY OF NATURAL HISTORY, ETC. 
PHILADELPHIA: 
C SHERMAN & SON, PRINTERS 
"1856. 
e 
