mermaid's purse

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mermaid's purse:

see rayray,
extremely flat-bodied cartilaginous marine fish, related to the shark. The pectoral fins of most rays are developed into broad, flat, winglike appendages, attached all along the sides of the head; the animal swims by rippling movements of these wings.
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References in periodicals archive ?
There will also be the chance to view a 'shark nursery' - home to egg-cases, or mermaid's purses, and newly-hatched baby sharks.
The hunt for eggcases, which are sometimes referred to as mermaid's purses, was organised in response to the decline in skate and ray found in UK waters.