Gryphaea, common name Devil`s toenails, is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae. These fossils range from the Jurassic to the Cretaceous periods. They are particularly common in many parts of Britain. These oysters lived on the sea bed in shallow waters, possibly in large colonies. The complete fossils con....
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http://en.wikipedia.org/wiki/Gryphaea
• (n.) A genus of cretaceous fossil shells allied to the oyster.
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http://thinkexist.com/dictionary/meaning/gryphaea/
extinct molluskan genus found as fossils in rocks from the Jurassic period to the Eocene epoch (between 208 million and 36.6 million years ago). ...
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http://www.britannica.com/eb/a-z/g/76
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