Shell. Transverse, oblong-ovate, or elliptical, flattened, slightly gaping at one side; summits projecting; hinge formed by two primary teeth in the left valve, and one in the opposite one Inhabits the European and American seas. Twenty-one species.
- Psammobia virgata.
- P. ferroensis.
- P. vespertina.
- P. muculosa.
- P. alba.
- P. Cayennensis.
- P. lævigata.
- P. Tellinella.
- P. cærulescens.
- P. elongata.
- P. flavicans.
- P. squamosa.
- P. pulchella.
- P. aurantia.
- P. fragilis.
- P. livida.
- P. galathea.
- · · · · ·
- P. lusoria.*
- P. fusca.*
- P. Pacifica.*
- P. Florida.*
3. Genus Psammotæa. Pl. [VII].
Animal. Unknown.
Shell. Of the same form as the Psammobia, but differing in the number of teeth, the left valve of the Psammotæa having only one tooth; and sometimes one valve is without teeth, while the other has two; ligament exterior, attached to callosities at the hinge, and without an irregular plait. Inhabits the Australian seas. Seven species. One fossil species.
- Psammotæa violacea.
- P. zonalis.
- P. pellucida.
- P. candida.
- P. tarentina.
- P. donacina.
- P. serotina.
N. Tellinaria. Seven Genera.
The two last of these genera have no lateral teeth, the rest have one or two.
4. Genus Tellina. Pl. [VII].
Animal. Body triangular, much compressed: the free edge of the mantle furnished with a row of tentacular, largest and longest in the rear; foot very large, compressed and pointed to the front; buccal appendages nearly as large as the bronchial laminæ, of which the external pair are much smaller than the internal; the anterior contractile muscle larger than the other; tubes very distinct.