tubularia

from The Century Dictionary.

• noun An old genus of tubularian hydroids, now restricted as the type of a family Tubulariidæ. T. indivisa is an example.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) A genus of hydroids having large, naked, flowerlike hydranths at the summits of long, slender, usually simple, stems. The gonophores are small, and form clusters at the bases of the outer tentacles.