"Serpula, a genus of Polychaete worms of the family Serpulidae, whose members construct coiled calcareous tbes of a whitish color, which are attached to stones or shells."—Finley, 1917

Serpula

"Serpula, a genus of Polychaete worms of the family Serpulidae, whose members construct coiled calcareous…

This worm is also called a fan worm, plume worm or red tube worm.
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"A Linnean genus of worms, subsequently used with various restrictions, now type of the family <i>Serpulidae</i>. They are cephalobranchiate tubicolous annelids, inhabiting cylindrical and serpentine or tortuous calcareous tubes, often massed together in a confused heap, and attached to rocks, shells, etc. in the sea." -Whitney, 1889

Calcareous Tubeworm (Serpula)

This worm is also called a fan worm, plume worm or red tube worm. "A Linnean genus of worms, subsequently…