At large, enrolled specimens of the giant phacopid trilobite Drotops megalomanicus. It's 2.6" wide and would be close to 5" long if it was outstretched. It has been nicely prepared, and all of the tubercles, bumps and eye facets can easily be seen. No significant restoration.
A photo of the Drotops quarry at Issoumour, Morocco showing the hard limestone layers being worked.
A photo of the Drotops quarry at Issoumour, Morocco. The quarry following the horizon where this trilobites are found extends several kilometers around the mountain.
How a Drotops might be found in the field, with part of the tail exposed in the broken rock. It would then be prepared using airscribes and air abrasives a process that would likely take 20+ hours for a good specimen..