"The <em>Serpulae</em>, which form irregularly twisted calcareous tubes, often grow together in large masses, generally attached to shells and similar objects; while those genera which, like the <em>Terebella</em>, build their residences of sand and stones, appear to prefer a life of single blessedness." &mdash; Goodrich, 1859

Serpula contortiplicata

"The Serpulae, which form irregularly twisted calcareous tubes, often grow together in large…