234 ILLINOIS BIOLOGICAL MONOGRAPHS [522 



EXPLANATION OF PLATE 



Pig. 98. Ligula intestinalis , union of vagina and vitelline duct with oviduct. The reference 



line is 0.1 mm. long. 

 Fig. 99. Cyathocephalus ainericanus, oocapt containing an ovum. 

 Fig. 100. Marsipotnetra hastata, genital cloaca from frontal section. 

 Fig. 101. Marsipotnetra hastata, cirrus sac from a transection. 

 Fig. 102. Bothriocephalus cuspidatus, median sagittal section, composite. 

 Fig. 103. Clestobotkrium crassiceps, median sagittal section, composite. 



