PREFACE. 



Anticipating that the publication of the Plates 

 forming the third volume of my late father's work 

 on the " Terrestrial Mollusks and Shells of the 

 United States," will excite increased attention to 

 that subject, it has been suggested to me by my 

 friend, Mr. Thomas Bland of New York, that a re- 

 print of the original descriptions and accompanjdng 

 remarks of Thomas Say will materially assist in the 

 study of this branch of Zoology. 



I have accordingly collected and now publish, 

 from the scattered and generally inaccessible wri- 

 tings of Mr. Say, all that relates to our terrestrial 

 species. 



These pages are offered to the Conchologists of 

 America and Europe to aid and encourage them in 

 their investigations, and to induce a just appreci- 

 ation of the labors of our first and greatest Naturalist, 



W. G. BINNEY. 



Germantowri, near Philoddphia, 

 Nov. 1856. 



