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From The Collaborative International Dictionary of English v.0.48:
Ventriculite \Ven*tric"u*lite\, n. [See Ventriculus.] (Paleon.) Any one of numerous species of siliceous fossil sponges belonging to Ventriculites and allied genera, characteristic of the Cretaceous period. [1913 Webster] 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. [1913 Webster]