PLATE 21 



Fig. 19', a, ~b, c, d. Mother-redia in various stages of extension. X 429. 

 if., intestine of redia. 



Fig. 20. Immature mother-redia. X 429. ph., pharynx. 



Fig. 21. Immature mother-redia. X 333. if., intestine of redia. 



Fig. 22. Immature daughter-redia contracted. X 372. 



Fig. 23. Immature daughter-redia extended. X 372. 



Fig. 24. Anterior end of mature daughter-redia extended. X 140. 



Fig. 25'. Anterior end of mature daughter-redia contracted. X 140. 



Fig. 26. Mature mother-redia containing daughter-rediae and germ balls. 

 X 112. dr., daughter-redia; drgb., daughter-redia germ ball; ph., pharynx. 



Fig. 27. Mature daughter-redia containing cercariae and germ balls. X 66. 

 t>p., birth pore; c, cercaria; cgb., cercaria germ ball; jr., intestine of redia. 



[380] 



