PROCEEDINGS 



OF THE 



ACADEMY OF NATURAL SCIENCES 



OF 



PHILADELPHIA. 



1875. 



PUBLICATION COMMITTEE. 



Joseph Leidy, M.D., Geo. W. Tryon, Jr., 



Wm. S. Vadx, Edw. J. Nolan, M.D., 



W. S. W. RtJSCHENBERGER, M.D. 



PHILADELPHIA: 



ACADEMY OF NATURAL SCIENCES, 



S. W. Corner Nineteenth and Race Streets. 



1875. 



