Source : Webster's Revised Unabridged Dictionary (1913)

Hyalospongia \Hy`a*lo*spon"gi*a\, n. pl. [NL., fr. Gr. ? glass +
   ? a sponge.] (Zo["o]l.)
   An order of vitreous sponges, having glassy six-rayed,
   siliceous spicules; -- called also {{Hexactinellin[ae]}}.