Ndmber 6. Jantjart, 1843. 



MONOGRAPH 



FRESHWATER UNIVALVE MOLLUSCA 



UNITED STATES, 



INCLUDING NOTICES OF SPECIES IN OTHER PARTS OF NORTH AMERICA. 



BY S. STEHMAN HALDEMAN, 



MEMBER OF THE PHILADELPHIA ACADEMY OF NATURAL SCIENCES. 



CONTENTS— GENUS PHYSA. 



PHILADELPHIA: 



PUBLISHED FOR THE AUTHOR BY J. DOBSON, 106 CHESNUT ST. 



New York: Wiley & Putnam. 



Paris: J. B. Bailliere Rue de l'ecole de medicine, 17. 



London: H. Bailliere, 219 Regent Street, 



E. G. Dorsey, Printer, 



Price to subscribers, $1 a number, of 5 plates, and one sheet of letter- 

 press, payable on the delivery of each. Single numbers, $1 25.- 



