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This small orange-red flatworm is characterized by one or more filamentous tails between its two caudal lobes. It was formerly common on Ulva in Little Harbor at Woods Hole, and on the mud flats of Hadley Harbor (Mark, 1892). It disappeared from the Woods Hole region with the eel grass, but has since been found near the breakwater at Provincetown. A close relative, Polychoerus carmelensis, has been found in enormous numbers at Carmel Bay, on the coast of California (D. P. Costello and H. M. Costello, 1938).