92 ILLINOIS BIOLOGICAL MONOGRAPHS [212 



EXPLANATION OF PLATE 



Gordius robustus 

 Fig. 75. — Cross section of male somewhat older than that of Fig. 72; X 195. 

 Fig. 76. — Cross section thru yoimg female of about the same age; X 195. 

 Fig. 77. — Cross section thru female with adult cuticula nearly complete; X 60. 

 Fig. 78. — Sagittal section thru posterior end of female, nearly adult; X 55. 

 Fig. 79. — Female at beginning of formation of adult cuticula; cross section near anterior end 



of body; X 130. 

 Fig. 80. — Cross section of male in same stage of development as female of Fig. 77; X 80. 



