Calceola sandalina.

Calceola sandalina

Calceola sandalina.

The prehistoric hexacoral, Cyathophyllum hexagonum.

Cyathophyllum hexagonum

The prehistoric hexacoral, Cyathophyllum hexagonum.

A fossil of the coral, Stauria astraeformis, a prehistoric hexacoral.

Stauria astraeformis

A fossil of the coral, Stauria astraeformis, a prehistoric hexacoral.