94 ILLINOIS BIOLOGICAL MONOGRAPHS 



EXPLANATION OF PLATE 



Gordius robustus 



Fig. 81, — Cross section thru cephalic ganglion just before formation of adult cuticiila; early 

 large cells near middle of section; X 160. 



Fig. 82. — Adjacent section just posterior to that of Fig. 81; X 160. 



Fig. 83. — Adjacent section posterior to that of Fig. 82; X 160. 



Fig. 84. — Young female; buds forming on ovarian tubes; X 270. 



Fig. 85. — ^Early stage in development of adult cuticula; formation of hyaline layer outside 

 of adult cuticula; X 640. 



Fig. 86. — ^Yoimg female; cross section showing early growth period in oocytes; X 170. 



