MONOGRAPHY 



OF THE 



FAMILY UNIONIDiE, 



OR NAIADES OF LAMARCK, 



(FRESH WATER BIVALVE SHELLS,) 



OF 



NORTH AMERICA, 



)H Of 



Sectional Library 



ILLUSTRATED BY FIGURES DRAWN ON STONE FROM NATURE. 



BY T. A. CONRAD, 



CURATOR OP THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA, HONORARY MEMBER OF 

 THE GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



PHILADELPHIA: 



J DOBSON, 108 CIIESNUT STREET. 



1836. 



