Chain-coral (Halysites catenulatus).

Chain-Coral

Chain-coral (Halysites catenulatus).

The common Devonian coral, Favosites polymorpha.

Common Devonian Coral

The common Devonian coral, Favosites polymorpha.

The prehistoric hexacoral, Cyathophyllum hexagonum.

Cyathophyllum hexagonum

The prehistoric hexacoral, Cyathophyllum hexagonum.