3.3" Psychopyge Trilobite With Short (Bitten?) Genal Spines
First the shell is naturally multi-toned transitioning from tan to black along the length of the trilobite. These multi-toned colorations are sometimes seen on trilobites from the site and it's due to part of the trilobite being closer to a fault in the rock which allows groundwater or hydrothermal fluids to leach minerals from the shell.
Secondly this type has an extremely long occipital spine and shorter rostrum than other species.
Third the genal spines are much shorter on this specimen. It looks like both show signs of healed injuries.