mermaid's purse
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mer·maid's purse
(mûr′mādz′)n.
The rectangular leathery egg case of certain elasmobranch fishes, especially the skates, often found washed up on beaches. Also called sea purse.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
mermaid's purse
n
(Zoology) another name for sea purse
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014