A Pictorial Atlas of Fossil Remains, consisting of coloured illustrations selected from Parkinson's "Organic remains of a former world," and Artis's "Antediluvian phytology."

by Gideon Algernon Mantell

Fig. 12. A fragment of the back or dorsal part of the shell of a fossil Nautilus (Nautilus centralis, of Sowerby), from the London clay, Brentford. The outer shell is broken away, and the siphuncle, traversing five of the septa of the chambers, is exposed.

Fig. 13. "The outline of the back of a Nautilus."—Mr. Parkinson.

Fig. 14. An Orthoceratite (Orthoceras annulatum, of Sowerby; O. undulatum, of Kissinger), from the Wenlock Limestone, Dudley.

Fig. 15. A fragment of a fossil Nautilus (Nautilus Parkinsoni, of Mr. Edwards), from the London clay of Harwich. It shows the situation of the siphuncle and the form of the septa, as indicated by the sinuous transverse lines.

Fig. 16. A polished section of a Nautilus (N. truncatus, of Sowerby), from the Inferior Oolite of Yeovil, Somersetshire. The chambers are filled up with crystalline limestone, with the exception of the six outermost cells, in which are left hollows that are lined with calcareous spar.

Fig. 17. Polished section of an Orthoceratite, from the Silurian strata of Oëland, Sweden.

Fig. 18. The discoidal part of a Lituite from the same locality as fig. 17.

Fig. 19. a polished slab of grey marble, from the Devonian formation of the Rhine. The figures are sections of Orthoceratites, a; and Lituites, b.