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Wiktionary
egg case

n. 1 A protective capsule that contains the eggs of some insects and molluscs 2 The leathery egg of certain marine animals such as sharks and skate

Wikipedia
Egg case (Chondrichthyes)

An egg case or egg capsule, colloquially known as a mermaid's purse or devil's purse, is a casing that surrounds the fertilized eggs of some sharks, skates, and chimaeras. They are made of collagen protein strands.

Because they are lightweight, they are commonly washed up by the sea, often found at the strandline, the farthest point of the high tide. The egg cases that wash up on beaches are usually empty, the young fish having already hatched out. Furthermore, egg cases are often found in commercial fishing gears like nets and pots, and on the sea floor during surveys using an ROV.

Egg case

Egg case may refer to:

  • Ootheca, an egg case made by some insects and molluscs
  • Egg case (Chondrichthyes), an egg case made by some sharks, skates, and chimaeras

Usage examples of "egg case".

She glanced up at the dark corner where the spider's egg case hung.

It had already eaten its own egg case but apparently had not yet begun to eat its host.

It had already eaten its own egg case, but apparently had not yet begun to eat its host.

You can put the egg case in a paper bag secured with a paper clip.

At least they'd found an egg case, and not one of the albino cockroaches.

THROUGH this evenings tide of faces unregistered, unrecognized, amid hurrying black shoes, furled umbrellas, the crowd descending like a single organism into the stations airless heart, comes Shinya Yamazaki, his notebook clasped beneath his arm like the egg case of some modest but moderately successful marine species.