88 ILLINOIS BIOLOGICAL MONOGRAPHS [208 



EXPLANATION OF PLATE 

 Gordius robtistus 



Fig. 60. — Sagittal section thru posterior end of young male; slightly older than that of Fig. 

 59, X 70. 



Fig. 61. — Similar section thru still older specimen; X 70. 



Fig. 62. — Young female; longitudinal section, showing budding of ovaries; buds not opposite; 

 X 55. 



Fig. 63. — ^Twelve day specimen of I 7; oblique section of posterior end, showing early intes- 

 tinal diverticula where reproductive organs later join; X 400. 



Fig. 64. — Similar section thru another specimen of the same lot; X 400. 



Fig. 65. — ^Twenty-eight day specimen of I 8; cross section of posterior end, showing 

 intestinal diverticula; X 400. 



Fig. 66. — ^Twelve day specimen of I 7; cross section; X 400. 



Fig. 67. — ^Twelve day specimen of I 7; longitudinal section of anterior end; shows disinte- 

 gration of cells in anterior part of intestine, cephalic ganglion in early stage, and tissue 

 growing in between intestine and cephalic ganglion; X 400. 



Fig. 68. — Similar section of another specimen of the same lot; X 400. 



Fig. 69. — Similar section of specimen from same lot; X 400. 



