This is a nice pair of unusual spiny trilobites. They are both "Devil-Horned" Cyphaspis from Morocco. You can easily see how they got their demonic nickname - they have a pair of spiny "horns" growing out of their heads. Both specimens have been prepared with these "Devil Horns" free-standing, as are the stalked eyes and the long axial spines. Both bugs have nice detail and aesthetics. And this is a natural double - both specimens are preserved as they were when they were buried millions of years ago. This is a very nice multiple plate of this "devilish" spiny trilobite.