Malvinella buddae
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Malvinella buddae is a very rare trilobite which lived in La Paz, Bolivia during the Devonian period. It is similar to phacops. It is always enrolled, 2-3 centimeters long in this state. This trilobite has large compound eyes, short spines and long nodes on its thorax. Often mistaken for Eldredgeia venustus, a more common Bolivian trilobite.
You can find more information in the web site
http://www.paleoprep.com/store_so_amer_trilos/010.htm