Source : Webster's Revised Unabridged Dictionary (1913)

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.

   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.