A Manual of Conchology / According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.

by Thomas Wyatt

P. fragilis.

P. livida.

P. Galathea.

P. virgata. The striped Psammobia. Pl. [7], fig. 1.

Species rather gaping, striated longitudinally, the teeth of the hinge considerably effaced.

P. Ferroensis. The Ferro Psammobia.

Oblong oval; white, radiated with crimson; finely striated transversely; valves obliquely truncated.

3. Psammotæa. Seven species.

Of the same form as the Psammobia, but differing in the number of teeth, as the left valve of the Psammotæa has only one tooth; sometimes one valve is toothless, while the other has two teeth.

Shell transverse oval or oblong; gaping a little at the sides; one primary tooth on each valve, though sometimes on only one of them; ligament exterior, attached to callosities at the hinge, and without an irregular plait.