PROCEEDINGS 



OF THE 



ACADEMY OF NATURAL SCIENCES 



OF 



PHILADELPHIA. 



UC 



1872. 



PUBLICATION COMMITTEE. 



Joseph Leidy, M.D., Wm. S. Vaox, 



Robert Bridges, M.D., Geo. W. Tryon, Jr., 



Edw. J. Nolan, M.D. 



PHILADELPHIA: 



ACADEMY OF NATURAL SCIENCES, 

 Corner Broad and Sansom Streets. 



1872. 



