PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPiitiA 



FOR PROMOTING USEFUL KNOWLEDGE 



M 



Vol. LVII. 1918. No. 6. 



CONTENTS 



PAGE 



The Nayades (Freshwater Mussels) of the Upper Tennessee Drainage. 



With Notes on Synonymy and Distribution. By A. E. Ortmann 531 



Brief Notes. By Benjamin Smith Lyman ..... 627 



Soldiers' and Sailors' Insurance. By Samuel McCune Lindsay . 632 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 

 104 South Fifth Street 



1918 



