The Polycladida represents a highly diverse clade of free-living marine turbellarian flatworms. They are known from the littoral to the sublittoral zone (extending to the deep hot vents), and many species are common from coral reefs. Only a few species are found in freshwater habitats. Often polyclads are associated with other invertebrates, such ...
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http://en.wikipedia.org/wiki/Polycladida
The polycladida is a marine order of Turbellaria. The gut has numerous caeca which ramify through the body. Numerous simple eyes are usually present.
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http://www.probertencyclopaedia.com/browse/BPA.HTM
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