Hyalospongia


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Hy`a`lo`spon´gi`a


n. pl.1.(Zool.) An order of vitreous sponges, having glassy six-rayed, siliceous spicules; - called also Hexactinellinæ.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.