

MONOGRAPH 



FRESH-WATER UNIVALVE MOLLUSCA 



UNITED STATES, 



(iK CONTINUATION OF PBOF. S. S. HALDEMAN's WORK, P0BLI6HBI) 

 UNDER THE ABOVE TITLE.) 



Bt GEORGE W 





TURBIDJE. 

 PHYSAD^. 



PHILADELPHIA: 



Published by 



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