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INDEX TO PLATES. 
E I. Fir,. I. — Bedia and cercaria from liver of Littorina littorca. 
A. Bedia full of cereariae. 
H. Young icdia 
C. Young cercaria. 
1). Full grown cercaria. 
Fin. EL— Encysted cercaria from liver of mussel. 
A. Cercaria in the cyst. 
H. Cercaria pressed out of cyst. 
E II. Fie. III. -Spororvsts from liver of cockle. 
FlG. IV. Sporocyst and Cercarin lineari* bom kidney of Lit- 
torimi littort'a. 
A. BporoojBt with cercaria 1 . 
B. Cercaria. 
C. Cercaria indifferent position. 
l'n.. V. — Sporoeyste and cercaria from liver of Littorina nidi*. 
A. Sporocysts with cereariae. 
R. Cereariae in natural positions. 
C. Cercaria unfolded. 
E III. Fk;. VI.— Sporocyst and cerarhr from liver of Huecinum niulatum. 
A. Sporocyst with cercarire. 
B. , C. and D. Cereariae in different positions. 
Fig. VII. - Sporocyst from Jlacoma bjlthica. 
PlO. VIII. — Cercaria from Tellina tenuis and Donax vittatus. 
