SMITHSONIAN INSTITUTION. 



UNITED STATES NATIONAL MUSEUM. 



SYNOPSIS OF THE NAIADES, OR PEARLY 

 FRESH-WATER MUSSELS. 



BY 



CHARLES TORREY SIMPSO 



Aid, Division of MollusJcs. 



From the Proceedings of the United States National Museum, Vol. XXII, pages oftl-1044 



(with Plate XVIII). 



[No. 1205.] 



' 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1900. 



