mermaid's purse

From other buckets he pulls specimens of black coral and a deep sea skate's egg case, a large version of what we landlubbers sometimes refer to as a mermaid's purse.

The ray was trapped in its egg case - known as a mermaid's purse - and would otherwise have died at Macduff Marine Aquarium in Aberdeenshire.

The ray was trapped in its egg case - known as a mermaid's purse - and would have died.

The egg cases were about the size of iPhones and the color of banana peels, with tails at the corners that give them their common name — “mermaid’s purse.”

"I haven't a penny with me, I'm afraid," answered Isobel, rummaging in her pockets, and turning out several interesting pebbles, a few shells, a mermaid's purse, and the remains of a spider crab.