STUDIES ON THE MORPHOLOGY OF THE SPOROCYSTS, REDIAE, AND MICROCERCOUS CERCARIA OBTAINED FROM TRICULA HUMIDA HEUDE INFECTED IN THE LABORATORY WITH MIRACIDIA OF PARAGONIMUS SZECHUANENSIS

<正> We have previously reported on the morphology and life history of Paragonimus szechuanensis (Chung and Ts’ao, 1962), a new lung fluke causing a new clinical entity with characteristic clinical manifestations, pathognostic histopathologic changes, and special epidemiologic features. We have also reported on the discovery of a minute fresh water snail Tricula humida as the first intermediate host of this new parasite, on the infection of the stone crab (Potamon denticulatus) with P. szechuanensis microcercous cercariae from naturally infected Tricula snails, and on the development of