Any one of numerous species of tubicolous annelids of the genusSerpula and allied genera of the family Serpulidæ. They secrete acalcareous tube, which is usually irregularly contorted, but issometimes spirally coiled. The worm has a wreath of plumelike andoften bright-colored gills around its head, and usually an operculumto close the aperture of its tube when it retracts.

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