What is a division of Spongiæ in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinæ called?

tetractinellida — A division of Spongiæ in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinæ. (Webster's 1913.)

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