Here is an unusual pair of trilobites from China. These are Arthricocephalus sp. from the Cambrian Changaspis layers. Arthricocephalus is much more uncommon and totally different in appearance than Changaspis. These ovoid trilobites are wonderfully articulated and exhibit very fine detail (better than the photo shows). Both sets of free cheeks are present and tightly attached, and even the rounded pygidiums are intact. The bugs have very good color and contrast and are beautifully showcased on the natural plate of shale that also contains an impression of a different type of trilobite. This is an excellent double example of this uncommon Cambrian trilobite.