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Four species of chitons (Mollusca: Polyplacophora) described by Sandberger and Rolle from the Oligocene of Germany and France are discussed and illustrated, providing for the first time SEM-images of the type-material and translations of the original descriptions. The material studied includes the holotype of Chiton modestus Rolle, 1862 and syntypes of Lepidopleurus virgifer Sandberger, 1859, Chiton oligocaenus Rolle, 1862, and Chiton reussi Rolle, 1862. All these species are considered valid. Redescription of the type material clarifies the identity of the species and enables comparison to related species from coeval deposits. [ABSTRACT FROM AUTHOR]

The only species of Polyplacophora known from the Eocene of Gánt is Tonicia pannonica. Re-examination of the type material of this species indicates that the two syntypes of Szőts belong to two different species. One of those syntypes (the tail valve) is designated as lectotype herein, in order to provide stability to nomenclature by preserving the generic attribution of the species pannonica to the genus Tonicia. New samples were collected near the type locality, and the nearly 200 valves recovered belong to four species: Tonicia pannonica, Lepidochitona gantensis sp. nov., L. szoetsi sp. nov., and L. viciani sp. nov. The paralectotype of Tonicia pannonica, an intermediate valve, is here excluded from that species and attributed to Lepidochitona szoetsi sp. nov. [ABSTRACT FROM AUTHOR]