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. They are among the common objects which are washed up by the sea. The egg cases that wash up on beaches are usually empty, the young fish having already hatched out. The size of egg cases vary; That excludes the four long tendrils found in each corner, which assist in anchorage. The colors and shapes of egg cases also vary greatly from species to species.
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