Being engaged in preparing a continuation of the 

 work of my 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. BINNEY. 



Address, Acad, of Natural Sciences, Philadelphia. 



