On the Occurrence of Daviesiella llangollensis (Dav.) in Derbyshire

The object of this paper is to deal more fully with the occurrence of Daviesiella llangollensis (Dav.) in the Carboniferous Limestone of Derbyshire, and further to make some observations on the sequence in the Midland area. In a later paper I hope to deal with the horizon of the “Brachiopod Beds”.