Shell narrow, long in the waist, inflated rather suddenly at the anterior third, rounded anteriorly, obliquely truncated at the vertex. Colour pale yellow. Sculpture: faint growth lines are cut at right angles by fine, sharp, incised, spiral lines, which are more or less obliterated medially, but distinct posteriorly. Aperture the full length of the shell, posteriorly enlarged, and leaning in towards the axis, medially constricted to a slit, and posteriorly opening in a pear-shaped expansion. The body whorl is overlaid by a sheet of callus. Columella slightly curved, broad inner margin subdentate, outer reflexed. Vertex pierced by a narrow, deep, axial perforation. Length, 5,4 mm.; breadth, 2,3 mm.
This is the species recorded from Watson's Bay by Brazier as Cylichna pyramidata, A. Ad.
The "Thetis" took a few specimens off Cape Three Points in 41-50 fathoms; off Wata Mooli in 54-59 fathoms; off Botany Bay