Part III of the Catalogue of the Fossil Cephalopoda in the British Museum (Nat. Hist.), by A. H. Foord and G. C. Crick, was published in 1897. Since then much fresh material has come into my hands and it is now possible to give much more accurate and fuller details of the horizons and localities at which the various species occur. This is of special importance, in view of the fact that the Goniatites can be used as zone indices of the Carboniferous Series from the upper part of the Dibunophyllum beds (D2 of Dr. Vaughan) up to the Middle Coal-measures. This I showed to be the case in my Presidential address to the Yorkshire Naturalists' Union, and published in the Naturalist, April to July, 1909, and elsewhere. Many details have, however, been added since then, and an elaborated and emended table will be published in a forthcoming paper by myself and Dr. Wilmore, F.G.S., on the Carboniferous succession of some Midland areas.