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230
Mr. Webster on the Strata lying over the Chalk.
| Limneus | corneus |
| perhaps a large specimen of L. longiscatus | |
| Gyrogonites | |
Striated seeds of a flattened oval form, with parts of coleopterous insects. [1]
M. Brongniart has enumerated the following fossils as belonging to this formation.
| Cyclostoma elegans antiquum | Limneus inflatus |
| Potamides Lamarckii[2] | Bulimus pygmeus |
| Planorbis rotundatus | – – – – – terebra |
| – – – – – cornu | Pupa Defrancii |
| – – – – – prevostinus | Helix lemani |
| Limneus corneus | – – – Desmarestina |
| – – – – – fabulum | Gyrogonites |
| – – – – – ventricosus |
The last mentioned fossil, to which Lamarck has given the name of Gyrogonites, is a small globular canellated body about the size of a mustard seed. The specimens of the French fossils of this species, in the possession of the Society, are extremely perfect, and correspond exactly to those which I found. They are very numerous in the freshwater stone at Gurnet point; but they are there
- ↑ These were found in some specimens of clay containing also freshwater shells which were dug out of a deep well at Newport. But as no distinct account was kept of the strata passed through, it is not certain to which of the freshwater formations they belong.
- ↑ It is proper to observe that the Potamides of Lamarck is a Cerithium. But having considered the cerithia as marine shells, he thought it proper, on finding a species among the freshwater shells, to regard this as of a distinct genus; founding the distinction not on any difference in its form, but on the difference of the water in which it had lived.
