1Q2 ILUNOIS BIOLOGICAL MONOGRAPHS [212 



EXPLANATION OF PLATE 

 Gordius robustus 

 Fig. 105. — Cross section of nerve cord of adult; X 700. 



Fig. 106. — ^Nerve cord in specimen with adult cuticula nearly complete; X 340. 

 Fig. 107. — Section near posterior end of male with fibrous cuticula nearly complete; X 120. 

 Fig. 108. — ^Section thru anterior end of same specimen as Fig. 107; X 120. 



