"Astarte has some fossil species in the crag and green sand: A. obliquata is one species.
"Venericardia is wholly a fossil genus: one species is found in the crag, V. senilis.
"The family Cardiacea contains
| Cardium | Cockle |
| Cardita | Chama (some species.) |
| Cypricardia | ——— |
| Hiatella | Mya. |
| Isocardia | Chama. |
"Isocardia cor is British. ([Plate 9.]) There is a beautiful species, Isocardia moltkiana from the East Indies, which is much valued by collectors.
"In the family Arcacea we find,
| Cucullea | Arca. |
| Arca | Arca, ark-shell. |
| Pectunculus | Arca. |
| Nucula | Arca. |