The Cnemidopyge specimen below was the first good specimen I owned. It was collected by Delyth Wilson from Anglesea. The cephalon has a long forward pointing spine which is characteristic of this type of trilobite
Later, I collected a more complete specimen of this Ordovician, Llandeilo age trilobite from Builth Wells in Wales. The three body axes can be clearly seen, though the central axis is displaced between the pleura (mid-body segments) and the pygidium (tail shield).