226 ILLINOIS BIOLOGICAL MONOGRAPHS [514 



EXPLANATION OF PLATE 



Fig. 78. Ligtda intestinalis, median portion of a transection thru the genital cloaca. 



Fig. 79. Schistocephalus solidus, median portion of transection thru ovary. 



Fig. 80. Schistocephalus solidus, median portion of transection thru the seminal vesicle and 



cirrus-sac. The reference line is 0.3mm. long. 

 Fig. 81. Bolhrimonus intermedius, transection thru the ovarian isthmus. 



