114 ILLIXOIS BIOLOGICAL MONOGRAPHS [394 



EXPLANATION OF PLATE 



Zygocotyle ceratosa 

 Fig. J2. Entire specimen, ventral view. X h. 

 Fig. 73. Cross section of esophageal bulb, showing the arrangement of the muscle 



fibers. X 45- Compare with Figures 60 and 70. 

 Fig. 74. Cross section of body thru the origin of the oral evaginations. X 45- 

 Fig. 75. Sagittal section thru the anterior part of the body showing oral sucker, 



an oral evagination and the anterior part of the esophagus. X 45- 

 Fig. 76. Sagittal section of posterior part of body thru one side of the acetabulum. 



X27. 

 Fig. 77. Sagittal section of the posterior part of the body near the median line, 



showing the ovary, eggs in the uterus, Laurer's canal, and the shape 



of the acetabulum. X 27. 

 Fig. 78. Sagittal section thru the body one section at the side of the genital pores 



showing the folded wall of the uterus and the ejaculatory duct 



which in this species is without a cirrus sac. X 136. 

 Fig. 79. Representation of the sagittal section thru the openings of Laurer's canal 



and the excretory vesicle. X 9°- 



