The mermaid's purse, a skate egg case, is a small black packet with two curling horns at each and. It surprises me that it is not called the devil's purse, but in any case it is a prized possession of young beach combers. Another common component of windrows on ocean beaches is a whelk egg case. These are usually a yellowish brown color and consist of stacked roughly discoidal compartments. Some of these contain tiny fragile stillborn shells. Some of these egg cases contain dozens of stacked compartments, and it makes you wonder how the poor mothers managed to produce them.
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