000® 4 
202 
4- Larval stages from Lymnaea crosseana 
A-B, metacercaria of Cercaria malayi II; C, agamodistome of Cercaria malay: II, D, tetracotyl; 
E, sporocyst with Cercaria malayi I. 
5. Cercaria malayi V 
A, metacercaria; B, agamodistome. 
6. Development of egg of Echinostoma revolutum 
A , freshly-passed egg; B, one day old egg; C, five days; D, seven days; E, nineteen days; F, twenty days; 
G, twenty-one days; H, empty shell with operculum burst open. 
