200 
O. 2 mm , 
i . Cercaria of Echinostoma revolutum 
A, B, living specimens ; C, preserved specimen. 
2. Cercaria malayi IV 
A-D, attitudes assumed under coverglass by living specimens; E, living cercaria under higher magnifi- 
cation (body contracted). 
3. Larval stages of Echinostoma revolutum 
A, mature redia; B> metacercaria. 
