lucernarida

from The Century Dictionary.

• A subclass of Hydrozoa, in which the base of the hydrosome is developed into an umbrella in the walls of which are the reproductive organs.

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

• noun plural A division of acalephs, including Lucernaria and allied genera; -- called also Calycozoa.
• noun plural A more extensive group of acalephs, including both the true Lucernarida and the Discophora.