Abstract
Calyptraea antiqua Howse (1848, 1858), based upon a plate from the Permian of England, was included in the Polyplacophora. King (1850) questioned this assignment sinceCalyptraeais a gastropod. Kirkby (1859) placedC. antiquus(Howse) in the genusChitonellusLamarck, 1819 and described two new species from the Permian of England,C. hancockianusandC. distortus. Kirkby and Young (1867) described another taxon,C. subantiquus, from the Carboniferous of Scotland. Branson (1948) questioned the assignment of these species to the Polyplacophora. Smith and Hoare (1987) rejected them from the class. Kirkby also included other specimens inChitonellus; these are now assigned to the polyplacophoranGlyptochitondeKoninck, 1883. Geinitz (1861) followed the assignment of Kirkby and recognized three species using Kirkby's (1859) illustrations.
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