The Collaborative International Dictionary of English v.0.48:

Perforata \Per`fo*ra"ta\ (p[~e]r`f[-o]*r[=a]"t[.a]), n. pl. [NL.
   See Perforate.] (Zool.)
      (a) A division of corals including those that have a
          porous texture, as Porites and Madrepora; -- opposed
          to Aporosa.
      (b) A division of Foraminifera, including those having
          perforated shells.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Aporosa \Ap`o*ro"sa\, n. pl. [NL., fr. Gr. ?. See Aporia.]
   (Zool.)
   A group of corals in which the coral is not porous; --
   opposed to Perforata.
   [1913 Webster]