Nidulites
noun
Nid·u·li·tes
-ˈlīt(ˌ)ēz
: a genus of hollow ovoidal calcareous fossils that have walls with a honeycomb structure and are often considered to belong among or to be related to the Porifera but are sometimes treated as calcareous algae
Word History
Etymology
New Latin, from Latin nidulus small nest + New Latin -ites