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Physa columnaris, Desh. Melanopsis buccinoidea, Ferr.; recent. The univalve shells most characteristic of fresh-water deposits are, Planorbis, Limnaea, and Paludina. Neritina globulus, Def. Nerita granulosa, Desh.
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.
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