IV. 



original copper-plates of Long's Expedition, which have been pur- 

 chased by Mr. Bailliere. Plate 75 is now for the first time published 

 from a copper-plate prepared by Mr. Say, 



All remarks of my own are distinguished by a difi'erent sized type, 

 and are followed by the letters " Ed." 



A large portion of the original manuscript of Mr. Say, and all the 

 works containing his conchological writings are deposited in the 

 noble library of the Academy of Natural Sciences of Philadelphia, 

 in whose collection are still preserved many of the original speci- 

 mens from which his descriptions were drawn. 



I leave to abler hands the rectification of the nomenclature of 

 Say's species, demanded alike by priority of publication, the advance- 

 ment of the science, and the much greater facilities for studying 

 them enjoyed by the American conchologist at the present day. 



W. G. BINNEY 



Burlington, N. J., June, 1858. 



