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Being engaged in preparing a continuation of the 
work of iny father, the late Dr. Amos Binney, on 
the “Terrestrial Mollusks and Shells of the United 
States, I take this opportunity of soliciting the 
assistance of those interested in the subject. Suites 
of local species from every part of the Union will 
be of great value to me in ascertaining the geogra- 
phical distribution of species. They will be grate- 
fully acknowledged, and, if required, shells given in 
exchange. I would also request any information 
relating to the subject, and any addenda or corri- 
genda to the “Mollusks.-^ 
Shells may be forwarded safely by mail, if packed 
in a pasteboard box, with tissue paper or cotton. 
Parcels exceeding the required weight of the Post- 
Office, may be sent by express. 
W. G-. BUSTNEY. 
Address, Acad, of Uatural Sciences, Philadelphia. 
