SEP 20 IBS? 



BULLETIN 



Illinois Qtate I aboratory 



OF 



NATURAL HISTORY. 



Urbana, Illinois. 

 VOLUME v. 



ARTICLE v.— PLANKTON STUDIES. II. ON PLEODORIXA 

 ILLIXOISENSIS, A NEW SPECIES FROM THE PLANK- 

 TON OF THE ILLINOIS RIVER. 



Bv C. A. KOFOID, Ph. D. 



Illinois State Laboratory of Natural History, 



L:RI5ANA, ILLINOIS. 



September, J 898. 



