Ceratarges was a genus of Lichidan Trilobite from the Middle to Late Devonian. It lived in what is now Jbel Issoumour in Morocco. Known for it's elongated "horns" protruding back from the head.
Trilobite : 2.5 x 1.1 inch / 6.3 x 2.7 cm
1 inch = 2.54 cm