This is a large Devonian trilobite. It is a Morocconites malladoids, named for the country in which it was found. This specimen has a long spine that protrudes from the front of the head. This is very unusual in trilobite morphology. The rest of the bug in nicely outsrtetched. It is beautifully centered on the sculpted matrix plate. And the small eyes even have the compound eye facets preserved. This is a very large example of this "unicorn" of trilobites.