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OF THE 
UNITED STATES, 
WITH LITHOGRAPHIC ILLUSTRATIONS, 
AND 
A MONOGRAPH ,\'i' ''SO.\ 
/ ' 
OF THE 
. I IT '• 
GENUS ANCULOTUS OF SAY; 
ALSO 
A SYNOPSIS OF THE AMERICAN NAIADES. 
BY T. a' CONRAD, 
Member of the Acad, of Natural Sciences of Philadelphia, 
PHILADELPHIA! 
Judah Dobson, 108 Chesnut Street, 
E. G. DORSEY, PRINTER, 
May 3, 1834. 
