(definition) by Webster 1913 Wed Dec 22 1999 at 3:45:10

Te*trac`ti*nel"li*da (?), n. pl. [NL., from Gr. tetra�xcf; + , , ray, spoke.] Zool.

A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.

 

© Webster 1913.

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