The present paper is the outcome of my examination of a collection of trematodes from various parts of Japan (including Formosa). The species of monostome came from a turtle caught in Singapore. Of the material certain species are left unidentified chiefly owing to the paucity of specimens. It may be mentioned that in the following description the parasites are arranged according to their hosts.
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H. Kobayashi (1920) studied this question.
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