Ceraurus pleurexanthemus Green, 1832.
Triangular block of grey limestone. On the upper surface is a complete Cheirurid. The pleurae are just beginning to separate following death. If perfect this specimen would be well over £100. Nice detail under magnification.
Upper Ordovician, Trenton Group, Neuville Formation.
Quebec City, Canada.
Trilobite : 3.6 cm long.
