Exogyra is an extinct genus of fossil saltwater clams, marine bivalve mollusks in the family Gryphaeidae, the foam oysters or honeycomb oysters. These bivalves grew cemented by the more cupped right valve. The left or upper valve is flatter, and the beak is curved to one side. Exogyra lived on solid substrates in warm seas. The subgenus Aetostreon...
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http://en.wikipedia.org/wiki/Exogyra
• (n.) A genus of Cretaceous fossil shells allied to oysters.
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http://thinkexist.com/dictionary/meaning/exogyra/
extinct molluscan genus common in shallow-water marine deposits of the Jurassic and Cretaceous periods (from 208 to 66.4 million years ago). Exogyra ...
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http://www.britannica.com/eb/a-z/e/59
Ex`o·gy'ra noun [ New Latin , from Greek ... out, outside + ... circle.]
(Paleon.) A genus of Cretaceous fossil shells allied to oysters.
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http://www.encyclo.co.uk/webster/E/88
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