Source : Webster's Revised Unabridged Dictionary (1913)

Tubulibranchiata \Tu`bu*li*bran`chi*a"ta\, n. pl. [NL., from L.
   tubulus a little tube + branchia a gill.] (Zo["o]l.)
   A group of gastropod mollusks having a tubular shell.
   Vermetus is an example.