NcJMBER 7. January, 1844 



^ 



MONOGRAPH 



FRESHAYATER 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— GENERA PLANORBIS & ANCYLUS. 



PHILADELPHIA: 



PUBLISHED FOR THE AUTHOR BY CAREY & HART, JUDAH DOBSON 

 AND JOHN PENNINGTON. 



New York : Wiley & Putnam. 



E. G. Dortey, Printer, 



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

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



