MONOGRAPH 



FRESHWATER UNIVALVE MOLLUSCA 



UNITED STATES, 



INCLUDING NOTICES OF SPECIES IN OTHER PARTS OF NORTH AMERICA. 



BY S. S. HALDEMAN, 



Professor of Zoology in the Franklin Institute, and Vice-President of the Entomological Society of 



Pennsylvania; Member of the Academy of Natural Sciences of Philadelphia ; of the 



Boston Society of Natural History ; of the Association of American 



Geologists and Naturalists ; and of the Societe" 



Cuvierienne of Paris, etc. 



PHYSAD^E. 



PHILADELPHIA: 



E. G. DORSEY, PRINTER, LIBRARY STREET. 

 1842. 



