Abstract
Over a period from June, 1980 to July, 1981, planorbid freshwater snails Gyraulus chinensis, were collected in rice fields at villages in Fukushima Prefecture where paramphistome infections were prevalent in cattle. Of 70 snails collected in village, 44.3% was infected with larval paramphistomes of various developmental stage. Two goats, A and B, wereorally given 450 and 500 metacercariae, respectively, from the infected snails. Goat B began to pass paramphistome eggs in the feces 56days after inoculation. Goat A was subjected to a post-mortem examination 52 days after inoculation. From its rumen 169 flukes were recovered at a recovery rate of 37.6%. The flukes were identified as Orthocoelium streptocoelium (Fischoeder, 1901) Yamaguti, 1971 by the following morphological characteristics: the excretory canal not crossed by Laurer's canal; the genital atrium with the genital sphincter; the acetabulum of the streptocoelium type, and the oral sucker of the Paramphistomum type by Nasmark
