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Nerita conoidea, Lam. Syn. Below the preceding formation, shelly sands are seen, of considerable thickness, especially at Cuisse-Lamotte, near Compiegne, and other localities in the Soissonnais, about fifty miles N.E. of Paris, from which about 300 species of shells have been obtained, many of them common to the calcaire grossier and the Bracklesham beds of England, and many peculiar.
In the last-named locality a Cytherea inhabited the mud around their roots. At the Three Islets several new species of Melampus, a Nerita and a Cyrena lived in a like habitat, and at Port Essington Cerithium kieneri, was found in the same situation. The fine Cyrena cyrenoides lives among the roots of mangroves in the Louisiade Archipelago.
Names in abundance were given it by successive observers, Nerita, Sciacca, Fernandina, Julia, Hotham, Corrao, and Graham. The last holds good in English speech, and as Graham's Island it is known in books to-day, though the sea took back what it had given, leaving but a shoal of cinders and sand.
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.
Thurmann has shown how remarkably this fact holds true in the Bernese Jura, although the argillaceous divisions, so conspicuous in England, are feebly represented there, and some entirely wanting. Terebratula digona, Sowerby. Natural size. Purpuroidea nodulata. One-fourth natural size. Cylindrites acutus. Sowb. Syn. Actaeon acutus. Patella rugosa, Sowerby. Nerita costulata, Desh.
Of the cones there are no less than eight species, some very large, whereas the only European cone now living is of diminutive size. The genus Nerita, and many others, are also represented by individuals of a type now characteristic of equatorial seas, and wholly unlike any Mediterranean forms.
The Nummulites planulata is very abundant, and the most characteristic shell is the Nerita conoidea, Lam., a fossil which has a very wide geographical range; for, as M. d'Archiac remarks, it accompanies the nummulitic formation from Europe to India, having been found in Cutch, near the mouths of the Indus, associated with Nummulites scabra.
Cypraa scurra, Chemnitz. 38. Cypraa erosa, Linne. 39. Cypraa caurica, Linne. 41. Cypraa talpa, Linne. 41B. Cypraea lynx, Linne. 42. Cerithium tuberosum, Fabricius. 43. Strombus tricornis, Lamarck. 45. Strombus gibberulus, Linne. 46. Strombus floridus, Lamarck. 47. Strombus fasciatus, Born. 48. Pterocera truncatum, Lamarck. 49. Planaxis breviculus, Deshayes. 50. Nerita marmorata, Reeve. 51.
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