Observations on some Bohemian and foreign cheirurid trilobites

Some new taxa of cheirurid trilobites are described from the Lower Palaeozoic of Bohemia and Portugal (see the names in the introduction). The cephala and pygidia of the species C. (Crotalocephalina)gibba gibba, C. (C.)globifrons and C. (C.)pauper have been determined. The speciesEccoptochiloides tumescens andE. scuticauda have been proved to be conspecific.