A MOl^OGRAPH 



TERRESTRIAL MOLLUSCA 



UNITED STATES. 



With Illustrations of all the Species, 



BY GEORGE W. TRYON, JR. 



This work will be published in quarterly parts, each containing 

 about 32 pp., 8vo., of text, and four lithographic plates crowded 

 with figures. It is believed that about five parts will suffice to 

 complete the work, which will then consist of about 155 pp. text, 

 and 16 plates. 



«.** Only 75 copies will be printed, so that an early application 

 will be necessary tc secure it. It has been thought advisable to 

 issue the following different styles, 25 copies of each : — 



1st. Plain Edition. Printed on fine calendered paper, with 

 uncolored plates. 



2d. Colored Edition. Same paper, the plates finely colored. 



8d. Fine Edition. On very heavy plate paper, and duplicate 



plates, plain on India paper, and colored. 

 The price has been fixed at the following low rate, which will 

 not half cover the expense of publication: — 



Plain Edition, . . . $1.25 per Part. 



Colored "... 2.00 " 



Fine, " . . . 3.00 



Cash payable on delivery. 



Subscribers to the American Journal of Gonchology will be sup- 

 plied at 20 per cent, discount from the above prices. 

 Subscriptions received by 



GEORGE W. TRYON, JR., 



625 Market Street. 





