
Phacops is a genus of trilobite in the order Phacopida, family Phacopidae, that lived in Europe and North America in the Silurian and Devonian periods. It was a rounded animal, with a globose head and large eyes, and probably fed on detritus. Phacops is often found enrolled, a biological defense mechanism that is widespread among smaller trilobite...
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http://en.wikipedia.org/wiki/Phacops

• (n.) A genus of trilobites found in the Silurian and Devonian formations. Phacops bufo is one of the most common species.
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http://thinkexist.com/dictionary/meaning/phacops/

genus of trilobites (an extinct group of aquatic arthropods) found as fossils in Silurian and Devonian rocks (between 345,000,000 and 430,000,000 ...
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http://www.britannica.com/eb/a-z/p/53
Pha'cops noun [ New Latin , from Greek ... a lentil + ..., ..., the eye.]
(Paleon.) A genus of trilobites found in the Silurian and Devonian formations.
Phacops bufo is one of the most common species.
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http://www.encyclo.co.uk/webster/P/68
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