NOTICE. 
In the last Will of Dr. Binney is the following clause : 
" Having, for several years past, heen collecting mate- 
rials at my leisure for the publication of a work concern- 
ing the Terrestrial Mollusc a of the United States of 
America, a large portion of which is ready for the press, 
and for which 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 arc a few discrepancies between the first and 
second volumes. The work was found to be less com- 
