The Collaborative International Dictionary of English v.0.48:

Campanularian \Cam*pan`u*la"ri*an\, n. [L. campanula a bell.]
   (Zool.)
   A hydroid of the family Campanularid[ae], characterized by
   having the polyps or zooids inclosed in bell-shaped calicles
   or hydrothec[ae].
   [1913 Webster]