Source : Webster's Revised Unabridged Dictionary (1913)

Calcispongiae \Cal`ci*spon"gi*[ae]\, n. pl. [NL., fr. L. calx,
   calcis, lime + spongia a sponge.] (Zo["o]l.)
   An order of marine sponges, containing calcareous spicules.
   See {Porifera}.