Ventriculites, fossil sponges found in the Cretaceous System (q.v.), and often giving their shape to flint nodules.
Ventriculites
Chambers's Encyclopaedia, Volume 10: Swastika to Zyrianovsk and Index, p. 456
Source scan(s): p. 0481
Ventriculites, fossil sponges found in the Cretaceous System (q.v.), and often giving their shape to flint nodules.