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The prevalence of salt-water remains is most conspicuous in some of the central parts of the formation. Helix labyrinthica, Say. Neritina concava, Sowerby. Lymnea caudata, Edw. Cerithium concavum, Sowerby. Searles Wood in Hordwell Cliff. It is also met with in Headon Hill, in the same beds.
a, b. Coscinopora globularis, D'Orbigny. Orbitolina concava, Parker and Jones. c. In the gravel pits of St. Acheul, and in some others near Amiens, small round bodies, having a tubular cavity in the centre, occur. They are well known as fossils of the White Chalk. Dr.
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