Bulletin 



OF THE 



Illinois State Laboratory 



OK 



Natural History 



Urbana, Illinois, U. S. A. 



STEPHEN A. FORBES, Ph.D., LE.D., 

 Director 



Vol. X. March, 1914 Article IH. 



STUDIES ON THE ENCHYTR^ID^ 

 OF NORTH AMERICA 



BY 



Paul Smith Welch, Ph.D. 



vy 



