| genera. | species.. | places. |
| Belemnite | Colin glen and Donald Hill | |
| Venus? Lin. | fragment of | Colin glen |
| Ostrea | Crista Galli | Ibid. |
| Ostrea | edulis | Ibid. |
| Arca | Glycimeris | Ibid. |
| Pecten | varia | Ibid. |
| Anomia | Ibid. | |
| Ditto | Gryphus, two varieties | Belfast Mountains |
| Mytilus | Cristal Galli | Colin glen |
| Ditto | lithophagus Lin. Tr. v. 8. p. 6. f. 1 |
Ibid. |
| Cardium? | Ibid. | |
| Serpula | Ibid. | |
| Dentalium | hexangalum | Ibid. |
| Pinna | lævis? | Carrickfergus |
| Echinus | Belfast Mountains |
F. Chalk.
The chalk formation in Ireland has hitherto been frequently distinguished by the name of white limestone, its compact texture having, caused those who were acquainted only with the superior beds of the English chalk formation to hesitate in admitting their identity: the occurrence of the cornu ammonis among the fossils of the Irish chalk was also supposed to furnish another distinctive character; in both these circumstances, however, it agrees with the lower beds of the English chalk; further, its geological position, (reposing as it does on the same bed of calcareous sandstone, with chloritic grains, which supports the English chalk) the analogy
