The Collaborative International Dictionary of English v.0.48:

Tubularida \Tu"bu*lar`i*da\, n. pl. [NL.] (Zool.)
   An extensive division of Hydroidea; the tubularians; --
   called also Athecata, Gymnoblastea, and Tubulariae.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Athecata \Ath`e*ca"ta\, n. pl. [NL., fr. Gr. 'a priv. + ? chest,
   box.] (Zool.)
   A division of Hydroidea in which the zooids are naked, or not
   inclosed in a capsule. See Tubularian.
   [1913 Webster]