Ovalocephalus (Fig.3L) is tentatively compared with O.primitivus Lu, which co-occurs with Hungioides in the Dawan Formation of Hubei Province The range of dikelokephalinids in general does not extend into the Upper Ordovician; Hungioides (Fig.3O) has an unusually wide peri-Gondwanan distri- bution, extending as far west as Portugal and Germany. A different species of Ovalocephalus is very common in the overlying Pa Kae Forma- tion.This genus is considered absolutely charac- teristic of, and confined to, the South China plate before the Ashgill (Lu, 1975).