Through the kindness of Mr. A. C. Seward, M.A., F.G.S., the British Museum has been put in possession of a fine specimen of this interesting species, collected by him in the Millstone Grit of Caton, Lancashire. The species is there found associated with Nautilus [Pleuronautilus] armatus, J. de C. Sowerby, Solenocheilus [Nautilus] latiseptatus, de Koninck, Actinoceras [Orthoceras] sulcatulum, M‘Coy, etc. These I have identified in a small collection submitted to me by Mr. Seward.