"These genera consist mostly of small shells, inhabiting stones, into which they bore holes. S. rugosa is British. Venerupis perforans is found on our coasts in stones. The valves of these shells have no accessory pieces like Pholas.
"Nymphacea is the next family, containing, in the first section,
| Sanguinolaria | Solen. |
| Psammobia | Tellina. |
| Psammotæa | —— |
"In the genus Psammobia we find our Tellina Feroensis. ([Plate 4.]) The shells of this and the preceding genus resemble the solens in a trifling degree, being a little open at the sides. In form they are near Tellina, but have not the fold on the anterior valve, but an angle on each valve. The ligament is exterior.
"In the second section are—
| Tellina | Tellina. |
| Tellinides | Tellina. |
| Corbis | Venus. |
| Lucina | Venus and Tellina. |
| Donax | Donax. |
| Capsa | Donax. |
| Crassina | Venus. |
CORBIS.
LUCINA.
CAPSA.
CYCLAS.