MONOGRAPH 



OF THE 



TEBBESTBIAL MOLLUSCA 



OF THE 



UNITED STATES. 



By GEO. W. TRYON, Jr. 



The Conchological Section offers for sale a few copies of this 

 work, which is just completed. It contains over 200 pages of 

 text, and is illustrated by eighteen lithographic plates, crowded 

 with figures. 



PRICES. 



Uncolored edition, . . - $ 8 50 



Colored " 13 50 



Fine " with duplicate plates, colored and 



tinted, printed on plate paper, . 20 00 



Any copies remaining unsold after January 1st, 1869, will be 

 advanced in price ten per cent. 



Address, 



E. J. NOLAN, M.D., 



Treasurer of Publication Committee, 

 Conchological Section of the Acad. Nat. Sci., Philadelphia. 



