Atys dactylus, sp. nov.
Shell date shaped, truncated above and below, minutely perforate above, deeply and narrowly umbilicate below. Colour white, glossy. Sculp ture—from sixty to seventy, irregularly waved, narrow, shallow grooves girdle the shell, between which are smooth, flat topped lyræ, two or three times their breadth; these are crossed at irregular intervals by fine and coarse growth I lines. The aperture is vertical, longer than the shell, narrowly arched, dilated above and below, rather effuse anteriorly. Above, the lip rises from the centre of the apical crater and folding back almost covers the perforation; the outer
lip is straight and simple; the columella broadly reflexed, emarginate without, tuberculate within, a short tongue of callus extends a little distance upwards along the body whorl. Length 4½, breadth 2½ mm.
One specimen from the lagoon beach.
This species appears to approach nearest to A. jeffreysi, Wein-kauff, from the Mediterranean, which served Monterosato as type for his genus Roxaniella.