Two species of marine cercariae were found in trochid gastropods from Hachijo Island, Japan and the specific names Cercaria hachijoensis and Cercaria rhipidocaudata are proposed. The former species was obtained from Trochus sacellus rota, Tectus pyramis and Omphalius nigerrimus and the latter from T. sacellus rota. C. hachijoensis is a cotylocercous cercaria with a single-pointed stylet, five pairs of penetration gland cells, long intestines reaching to the level of the posterior end of acetabulum, a flame cell formula of 2[(2+2)+(2+2)]=16 and develops in sporocysts. C. rhipidocaudata has a fan-shaped tail bearing three pairs of projections, a pair of single-pointed stylets, a flame cell formula of 2[(2+2)+(2+2)]=16 and develops in rediae.