Egg Case (mermaid’s Purse)
An egg case or egg capsule, often colloquially called a mermaid’s purse, is the casing that surrounds the eggs of oviparous chondrichthyans. Living chondricthyans tha
Humans have been interested in echinoid fossils (the fossilised remains of sea urchins) for millennia, considering them lucky and imbuing them with magical powers linked to their deities
A folk tradition in Denmark and southern England imagined sea urchin fossils to be thunderbolts, able to ward off harm by lightning or by witchcraft, as an apotropaic symbol. A