NEW 
Hresh Water Shells 
OF THE 
UNITED STATES, 
WITH COLOURED ILLUSTRATIONS, 
% - ‘ 
AND 
A MONOGRAPH 

OF THE | 
GENUS ANCULOTUS OF SAY; Poe 
/ tay 
ALSO ‘4 Ny 
A SYNOPSIS OF THE AMERI IADES. 


| BY T. A. CONRAD, eae = 
j Member of the Acad, of Natural Sciences of Philadelphia. | : 
om 
PHILADELPHIA: . 
Jupan Dosson, 108 Cuesnur Srreer. . 
E.G. DORSEY, PRINTER. tae . = se 
1834, 

