OAN 16 1900 



BULLETIN 



OF THE 



Illinois Qtate I aboratory 



OK 



NATURAL HISTORY, 



Urbana, Illinois. 



VOLUME Y. 



ARTICLE' VII I.— A STATISTICAL STUDY OF THE PARA- 

 SITES OF THE UXIONID.F. 



BY H. M. KELLY, A. M. 



Illinois State Laboratory of Natural History, 



I Ur.ANA. ILLINOIS. 



'March, J899. 



