Abstract
Summary Productus hemisphaericus J. Sowerby is redescribed and designated type species of the new genus Linoprotonia. Productus corrugatohemisphericus (Vaughan) is also redescribed and referred to the genus, together with Linoprotonia ashfellensis sp. nov. which is common in north-west England and has often been erroneously referred to P. corrugatohemisphericus. Other previously described Lower Carboniferous species showing similar external form to Linoproductus are considered to belong in the new genus Linoprotonia. An attempt is made to show the relationship between these Lower Carboniferous forms and the gigantoproductids, linoproductids and striatiferids. It is suggested that these genera may form a phylogenetic lineage.
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