PROCEEDINGS 



OF THE 



ACADIMY OF NATURAL SCIENCES 



OF 



PHILADELPHIA. 



No. 3.— June, July and AuLJiist, 1868. 



PHILADELPHIA: 



ACADEMY OF NATURAL SCIENCES, 



Corner of Broad aud Sansom Streets 



1S68. 



,ii^ 



Merribew & Son, Printers, 243 Arcli St., Philadelphia. 



