Source : Webster's Revised Unabridged Dictionary (1913)

Tubicolae \Tu*bic"o*l[ae]\, n. pl. [L. tubus a tube + colere to
   inhabit.] (Zo["o]l.)
   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}.

Capitibranchiata \Cap`i*ti*bran`chi*a"ta\, n. pl. [NL., from L.
   caput, capitis, head + -branchiae gills.] (Zo["o]l.)
   A division of annelids in which the gills arise from or near
   the head. See {Tubicola}.