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Either of two sand-dwelling brachyuran crabs (Persephona mediterranea or P. punctata) of the US Atlantic coast, the Gulf of Mexico, and the West Indies, having a rounded body and, in the female, a purselike chamber for eggs.
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.