234 ILUNOIS BIOLOGICAL MONOGRAPHS [522 



EXPLANATION OF PLATE 



Fig. 98. Ligula intestinaits , union of vagina and vitelline duct with oviduct. The reference 



line is O.lnim. long. 

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

 Fig. 100. Marsipomelra haslala, genital cloaca from frontal section. 

 Fig. 101. Marsipomelra haslala, cirrus sac from a transection. 

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

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



