
Calymene (meaning beautiful crescent as a reference to the glabella) is a genus of trilobites in the order Phacopida that were found throughout North America, North Africa, and Europe in primarily Silurian outcrops. Calymene is closely related to Flexicalymene, and both genera are frequently found inrolled. Calymene trilobites are small, typically...
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http://en.wikipedia.org/wiki/Calymene

• (n.) A genus of trilobites characteristic of the Silurian age.
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http://thinkexist.com/dictionary/meaning/calymene/

genus of trilobites (extinct arthropods) dating from the Ordovician Period (505 to 438 million years ago). Well known in the fossil record, Calymene ...
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http://www.britannica.com/eb/a-z/c/10
Ca·lym'e·ne noun [ Greek concealed, past participle of ... to conceal.]
(Zoology) A genus of trilobites characteristic of the Silurian age.
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http://www.encyclo.co.uk/webster/C/11
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