228 ILUNOIS BIOLOGICAL MONOGRAPHS [516 



EXPLANATION OF PLATE 



Fig. 82. Cyathocephdus amerkanus, transection thru ovarian isthmus. 



Fig. 83. Marsipometra hastata, transection thru ovarian isthmus. 



Fig. 84. Bothriocephalus scorpii, transection thru ovary. 



Fig. 85. Bothriocephalus daviceps from EupomoHs gibbosus, transection thru ovaiy. 



Fig. 86. Bothriocephalus cuspldatus, transection thru ovary of mature proglottis. 



