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. 4. A variety of Siphonia (Jerea excavata, of Michelin), from the greensand of Wiltshire.

Fig. 5. A silicified Siphonia from Saumur.

Fig. 6. A Ventriculite from a gravel-pit; the markings are produced by the exposed and partially abraded outer integument, which in perfect examples consists of a regular net-work of sub-cylindrical fibres.

Fig. 7, is a transverse section of a Siphonia (Siphonia pyriformis of Goldfuss).

Fig. 8. A nearly perfect specimen of a similar fossil. In fig. 7, are shown sections of tubes passing from the periphery to the centre; in fig. 8, the central aperture of the cavity of the bulb, and part of the stem, are displayed.

Figs. 9, & 10, are imperfect specimens of Choanites: fig. 10, is a vertical section showing the central cavity and the connected tubes.

Fig. 11, is another example of Siphonia pyriformis.

Fig. 12, a vertical, and fig. 13, a transverse section, of the same species of Siphonia.

Fig. 14. A small turbinated calcareous spongite from Switzerland.

Fig. 15. The appearance of the animal membrane exposed by immersion of the fossil (fig. 14), in diluted hydrochloric acid.