Article: The Upper Cambrian trilobite Irvingella nuneatonensis (Sharman)
Irvingella nuneatonensis (Sharman 1886), of which the complete dorsal exeskeleton is known, is redescribed, illustrated for the first time, and distinguished from other species. The ventral cephalic sutures and rostrum are like those of Dunderbergia (family Elviniidae). Three abnormally developed individuals are described. I. nuneatonensis comes from the upper part of the Zone of Olenus (above the base of the Subzone of Olenus dentatus) and its horizon is not below the upper part of the Elvinia Zone of the Upper Cambrian sequence in the U.S.A.