STUDIES ON THE TREMATODES, INVADING LYMNAEA SNAILS AS THE FIRST INTER-MEDIATE HOSTS FOUND IN THE VICINITY OF MUKUDEN. I
ON THE STRUCTURE OF THEIR CERCARIAE, EFFECTS OF THEIR INFESTATION ON THE HOST SNAILS, AS WELL AS THE CYST-FORMATION OF STYLET-CERCARIAE BY THE ACTION OF THE MAMMALIAN BLOOD SERUM