| The name also, which originally was lingula, gives an idea of the form. |
| The lingula Flags mark a local return to shallower water conditions, especially in the central portion. |
| The genus lingula has also come down from remotest ages, having outlived all its earlier associates. |
| Immediately above the lingula, four or five folia constitute the central lobule of the vermis, which is continuous laterally with the ala of the central lobule. |
| The curious Crania, Discina, and lingula are still living, and are mostly found in the seas of the southern hemisphere. |
| The ancient lingula, along with Crania and Orbiculoidea, occur among the inarticulate forms. |
