454 EXPLANATION OF PLATES. 



Plate X. 



A, B, C, D.— MONOSTOMUM (CERCARIA LOrHOCERCA). 



A. Redia. 

 B, C, D. Cercarite. 



E, F, G. — Cercaria oocysta. 



E. Sporocyst containing encysted cercarise and cercarise 



in different stages of development. 



F. Cercaria from cyst. 



G. Encysted cercaria. 



Plate XI. 



DiSTOMUM (ECHINOSTOMUM) LEPTOSOMUM. 



A, B, C. Redise, 



D. Head of older redia. 



E. Favourite position of cercaria. 



F, C. Cercaria in different positions when moving. 



H. Full grown cercaria. 



J. Head of cercaria showing gland ducts. 



K. Head of cercaria (side view). 



L. Encysted cercaria. 



Plate XH. 



DiSTOMUM (ECHINOSTOMUM) LEPTOSOMUM. 



X about i6A. 



GA. 



Genital aperture 



OD. 



Oviduct. 



EG. 



Egg. 



OV. 



Ovary. 



T. 



Testes. 



V. 



Vitelline glands. 



E. 



Excretory pore. 



Plate XHI. 

 Bucephalus haimeanus. 



A. Sporocyst. 



B. Full grown cercaria. 



C. Young cercaria. 



