[4] The flat pebblesnail is a small snail in the family Lithoglyphidae; however, the species has a large and distinctive-looking shell.

Testâ, laevi, rotundatâ, diaphanâ, luteo-corneâ; spirâ valdè depressâ; suturis leviter impressis; anfractibus trinis, inflatis; aperturâ semirotundâ; labio dilatato, albo, incrassato, edentulo et incurvato ; labro dilatato, tenui, margine acuto.

His very close observation and active investigation of the waters of central and northern Alabama, have enabled him to lay the naturalists of this country under many obligations by new discoveries, and this is certainly one of much importance.

We now see for the first time that this genus, which is common in Europe, Africa, Asia, South America and the West Indies, also inhabits our southern fresh waters.

It is more rotund than usual, has a clear horn-colored epidermis, smooth and shining; the substance of the shell so thin as to permit the column to be visible through it.

The flat pebblesnail is found attached to clean, smooth stones in rapid currents of river shoals.