Phacops

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 (an organic material)Phacops is often found rolled up, a biological defense mechanism that is widespread among smaller trilobites but nearly perfected by this genus.