106 ILLINOIS BIOLOGICAL MONOGRAPHS [324 



PLATE IX j 



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Fig.36-42. Inclusive. Consecutive 20 micra sections of oral sucker, Cyc/ocoetow AaWi. X71. ] 



Fig. 43, Cross section of oral sucker, Cydocoelum pseudomicrostomum. X90. ' 



Fig. 44. Cross section through anterior portion of oral sucker, Cydocoelum elongalum. X90. i 



Fig. 45. Cross section through genital atrium, Cyc/ocoe/wm e/oMgo^MW. Xl2. ; 



Fig. 46. VrontdX section, Cydocoelum elongatum. X105. i 



Figs. 47 & 48. Cross sections of oral sucker of Cydocoelum elongalum, posterior to that in i 



figure 44. X90. j 



