94 ILLINOIS BIOLOGICAL MONOGRAPHS 



EXPLANATION OF PLATE 

 Gordius robustus 



Fig. 81. — Cross section thru cephalic ganglion just before formation of adult cuticula; 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. — ^Young female; cross section showing early growth period in oocytes; X 170. 



