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From: Webster's Revised Unabridged Dictionary (1913)

 Ven·tric·u·lite n.  Paleon. Any one of numerous species of siliceous fossil sponges belonging to Ventriculites and allied genera, characteristic of the Cretaceous period.
 Note:Many of them were shaped like vases, others like mushrooms. They belong to the hexactinellids, and are allied to the Venus's basket of modern seas.