NOTICE. 



In the last "Will of Dr. Binney is the following clause : 

 " Having, for several years past, been collecting mate- 

 rials at my leisure for the publication of a -work concern- 

 ing the Terrestrial INIollusca of the United States of 

 America, a large portion of which is ready for the press, 

 and for wliich numerous engravings have been prepared, 

 my will is, that in case of my decease before the same 

 shall be published and distributed, my executors shall 

 employ some competent person or persons to prepare 

 the same for the press, and shall publish the same at the 

 expense of my estate." 



At the request of the executors, I have endeavored to 

 fulfil the wish above expressed. The plan laid out by 

 him has been strictly followed, though in some in- 

 stances contrary to my own opinions, and it has been 

 departed from only where observations since his decease 

 have rendered it imperative. The consequence is, that 

 there are a few discrepancies between the first and 

 second volumes. The work was found to be less com- 



VOL. I. B 



