BULLETIN 



OF THE 



ILLINOIS STATE LABORATORY 



OF 



NATURAL HISTORY 



LIBRA 



NEW yo; 



Urbana, Illinois, U. S. A. 



Vol. VII. December, 1905. Aktki.k \ . 



NOTES ON SPECIES OF NORTH AMERICAN OLIGOCil KT \ . V. THE 

 SYSTEMATIC RELATIONSHIPS OF LUMBRICULUS (THINODRILUS) (N- 

 CONSTANS (SMITH ). 



BY 



FRANK SMITH, A. M., 

 Assistant Professor of Zoology, University of Illinois. 



December 26, 1905. 



