"Borings apparently attributable to parasitic worms are not uncommon in Permian brachiopod and pelecypod shells in Western Australia. The nomenclature of Clionolithes and Palaeosabella is discussed and it is concluded that both names refer to boring sponges. Most of the boring worms of the Paleozoic seem to be without available names. The new genus Conchotrema is established for certain types of worm borings in shells of Devonian, Mississippian and Permian age. Another genus is discussed, but not named."