228 ILLINOIS BIOLOGICAL MONOGRAPHS [516 



EXPLANATION OF PLATE 



Fig. 82. Cyathocephalus americanus, transection thru ovarian isthmus. 



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



Fig. 84. Bothriocephalus scorpii, transection thru ovary. 



Fig. 85. Bothriocephalus claviceps from Eupomotis gibbosus, transection thru ovary. 



Fig. 86. Boikriocephaltis cuspidatus, transection thru ovary of mature proglottis. 



