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An extensive order of parasitic worms. They are found in the internal cavities of animals belonging to all classes. Many species are found, also, on the gills and skin of fishes. A few species are parasitic on man, and some, of which the fluke is the most important, are injurious parasites of domestic animals. The trem…

One of the Trematodea. Also used adjectively.

f or pertaining to the Trematodea. See Illustration in Appendix.

are believed to be analogous in function to the kidneys of vertebrates. See Illust. under Trematodea, and Sporocyst.