Hydrocorallia /(?)/

Hy·dro·co·ral·li·a

Hydrocorallia

n. pl.
  1. A division of Hydroidea, including those genera that secrete a stony coral, as Millepora and Stylaster. Two forms of zooids in life project from small pores in the coral and resemble those of other hydroids. See Millepora. (Zool.)