Keywords: Crenella discors (Sowerby).jpg En Crenella discors Mytilus Linnaeus accepted as Musculus discorshttp //www marinespecies org/aphia php p taxdetails id 140472 From Illustrated Index of British Shells Plate VII Fig 13 1859 Illustrated Index of British Shells Plate 07 jpg Creator George Brettingham Sowerby II PD-Art PD-old-100 Musculus discors Illustrated Index of British Shells |