300 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Plate Y. 



Fig. 12. Tetrarliynclius tetrabothrius. Head and neck. 

 Mag. 46 dia. 



Fig. 13. Cercaria ftssicauda. Cercaria isolated from 

 Cardium edule. Magnified. 



Fig. 14. Distomum valdeinflatum. Head, showing 

 the armature of head and neck. Mag. 233 dia. 



Fig. 15. Distomum valdeinflatum. Larva still 

 enclosed in outer and inner cysts. Mag. 40 dia. 



Plate VI. 



" Lymphocystiasis." Flounder (Pleuronectes flesus) 

 infected with the Sporozoan Lymphocystis johnstonei, 

 Woodcock. Slightly reduced. Photograph by A. Scott. 



Reference Letters. 



Ant.sk. = Anterior sucker. Pb. — Proboscis. 



Cy. = Cyst wall. Pb.sh. = Proboscis sheath. 



Cy.Ext. = External cyst. Par. = Parasite. 



Cy.Int. —■ Internal cyst. Sp. = Spine. 



Cir. = Cirrus. Te. = Testis. 



Con.b. — Contractile bulb. Ut. = Uterus. 



Int. = Intestine. Yit. = Vitellarium. 



Or.sk. = Oral sucker. Yit.Dt. = Duct of the vitellarium. 



Ov. — Ovary. V.sk. = Ventral sucker. 



Ph. = Pharynx. 



