glass sponge

Noun

 * 1) Any species of the class  of sponges, which have a skeleton made of four- and/or six-pointed siliceous spicules.
 * 2) * 1996, Carroll Lane Fenton, Pat Vickers Rich, Mildred Adams Fenton, Thomas H. V. Rich, The Fossil Book: A Record of Prehistoric Life, Revised Edition 1989, New Corrections 1996, page 114,
 * Glass sponges are rare in the Ordovician and Silurian but are preserved in enormous numbers in Late Devonian formations of western New York.

Synonyms

 * , hexactinellid