The Collaborative International Dictionary of English v.0.48:

Tubicolae \Tu*bic"o*lae\, n. pl. [L. tubus a tube + colere to
   inhabit.] (Zool.)
   A division of annelids including those which construct, and
   habitually live in, tubes. The head or anterior segments
   usually bear gills and cirri. Called also Sedentaria, and
   Capitibranchiata. See Serpula, and Sabella.
   [1913 Webster]