Article: Revision of two Upper Cambrian trilobites

Conocoryphe? bucephala Belt, 1868, from the Upper Ffestiniog and Lower Dolgelly Beds of Wales and possibly England, is re-illustrated; the pygidium is described for the first time; the species is transferred from the Olenid genus Beltella to which it was referred by Lake (1919) to Parabolinoides Frederickson, a genu: widely known in the approximately contemporaneous Conaspis Zone in the U.S.A.Sphaerophthalmus major Lake, 1913, though regarded by Henningsmoen (1957) as of questionable validity is distinguishable from other species of Sphaerophthalmus; S. major occurs in England, Wales, and Sweden, anc probably in Norway and eastern Canada, in the Zone of Peltura scarabaeoides.