74 ILLINOIS BIOLOGICAL MONOGRAPHS [520 



EXPLANATION OF PLATE 



Fig. 14. Immature redia of Cercaria urbanensis. X 88. 



Fig. 15. Redia of Cercaria inhabilis. X 88. 



Fig. 16. Mature Cercaria inhabilis, ventral view. Cystogenous glands not shown. 



X 88. 

 Fig. 17. Cross section of Cercaria inhabilis in region of eye-spots. X 195. 

 Figures 18 to 21. Anterior body region of different stages of Cercaria inhabilis, 



showing changes in pigmentation. X 140. 

 Fig. 22. Cross section of the tail of Cercaria inhabilis. X 433. 



