Shell very small, long and narrow, laterally compressed, sides parallel. Nearly the whole surface of my specimens is eroded, but near the margin traces of radiate fine riblets can be seen. Colour light brown, with a few concentric bands of darker. Apex situate at about the anterior fourth, rounded ; side slopes steep and straight, anterior slope straight, posterior slope convex. Inside with the central area dark brown, lighter under the apex, a narrow brown border on the margin ; space between this and the spatula covered by a whitish callus. Length, 4 mm. ; breadth, 1,75 mm. ; height, 1,5 mm.

This curiously shaped species resembles somewhat the Californian species Tectura paleacea (A.A. Gould, 1853), and Tectura depicta (R.B. Hinds, 1842). Whether in this case the narrow elongated form is an adaptation to life on fronds of seaweeds I am unable to say, but it seems very likely.

New Zealand. Dunedin, type (A. Hamilton) ; Blind Bay, Nelson.