90 ILLINOIS BIOLOGICAL MONOGRAPHS (210 



EXPLANATION OF PLATE 



Gordius robustus 



Fig. 70. — Young male; section near posterior end; junction of intestine and sperm ducts; 

 X 380. 



Fig. 71. — Cross section posterior to that of Fig. 70; X 380. 



Fig. 72. — ^Young male; same specimen as Fig. 29; section thru middle of body; X 380. 



Fig. 73. — ^Anterior end of young specimen; longitudinal section; shows intestine ending con- 

 siderably posterior to cephalic ganglion, renmants of proboscis, and cord connecting 

 stylets with partition between body and proboscis; X 220. 



Fig. 74. — Similar section of specimen almost fully developed; X 105. 



