This is a classic U.S. trilobite. It is a fine Arctinurus boltoni from the Silurian of New York. This is one of the most sought-after and displayable types of trilobites from New York. We collected the quarry for a year, and only found a handful of complete specimens. This wonderfully articulated trilobite is prone and exhibits fine detail. The cephalic process and the eyes of the trilobite are easily seen. The pleural spines terminate in sharp points and the broad, fan-shaped pygidium is beautifully displayed. The entire carapace of the trilobite is covered with small pustules. The fossil has great color and contrast and is well centered on the large, squared matrix plate. And, best of all, this is a split pair, one of the elite few Arctinurus that the counterpart was kept with the positive (counterpart not pictured, but is just as nice as the positive.) This is a very distinct example of a part/counterpart Arctinurus.