gymnoblastea

from The Century Dictionary.

• In Allman's system, an order of hydroid polyps, corresponding to the Anthomedusæ of Haeckel's later system, and commonly known as tubularian hydroids (in distinction from both campanularian and sertularian hydroids, which are calypto blastic).

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

• noun plural (Zoöl.) The Athecata; -- so called because the medusoid buds are not inclosed in a capsule.