106 ILLINOIS BIOLOGICAL MONOGRAPHS [324 



PLATE LX 



Fig.36-42. Inclusive. Consecutive 20 micra sections of oral sucker, Cyclocoelum halli. X71. 

 Fig. 43. Cross section of oral sucker, Cyclocoelum pseudomicrostomum. X90. 

 Fig. 44. Cross section through anterior portion of oral sucker, Cyclocoelum elongatum. X90. 

 Fig. 45. Cross section through genital atrium, Cyclocoelum elongatum. X 12. 

 Fig. 46. Frontal section, Cyclocoelum elongatum. X 105. 



Figs. 47 & 48. Cross sections of oral sucker of Cyclocoelum elongatum, posterior to that in 

 figure 44. X90. 



