218 ILLINOIS BIOLOGICAL MONOGRAPHS [506 



EXPLANATION OF PLATE 



Fig. 55. Bothriocephalus scorpil, three anterior primary segments, toto preparation. The 



stars at the side indicate the extent of the segments. 

 Fig. 56. Bothriocephalus scorpii, one farther back, also toto. 

 Fig. 57. Bothriocephalus scorpii, another, showing reproductive rudiments. 

 Fig. 58. Clestohothriiim crassiceps, primary segment with reproductive rudiments, toto 



preparation. 



