PROCEEDINGS 



ACADEMY OF NATURAL SCIENCES 



PHILADELPHIA 



1889. 



COMMITTEE OF PUBLICATION: 



Joseph Leidy, M. D., Geo. H. Horn, M. D., 



Edw. J. Nolan, M. D., Thomas Meehan, 



John H. Redfield. 



Editor: EDWARD J. NOLAN, M. D. 



PHILADELPHIA: 

 ACADEMY OF NATURAL SCIENCES, 



LOGAN SQUARE. 

 1890. 



