Shell elongately-fusiform, moderately thick. Whorls eight; nucleus absent from all the specimens (eight). Spire elongated, whorls regularly convex, with spiral lira (on the penultimate six primary, and four smaller intermediate in the anterior part), acute, about one-third as wide as the interspaces, crossing over inconspicuous longitudinal rounded costelae (15 on penultimate whorl), as wide as the intervals. Sublenticular longitudinal incremental stride not crossing the lira. Suture distinct, slightly marginate. Last whorl regularly convex, with about 22 acute spiral lira, and eight interstitial striae gradually becoming stouter anteriorly until they are as valid as the lira; obsolete longitudinal curved costellae above the periphery, becoming gradually less conspicuous until they disappear, remaining longest close to the suture; near the aperture in a large example they reappear. Aperture obliquely-elongately-oval, descending into the canal, pinched into a tiny furrow posteriorly by the marginate suture. Outer lip simple, slightly sinuous, thin, finely crenated, obsoletely lirate internally. Columella subarcuate, subconvex at the beginning of the canal; only a trace of callus, except anterior to the varix of the notch where it is subconcavely reflected, and forms a minute rimate umbilicus. The spiral lira are almost quite obliterated at the inner lip, and three subraised thread-like plicae are visible deeper in the throat, equal and equidistant, and with the same obliquity as the spiral lira, the highest at the centre of the aperture; sometimes a fourth exists close below them. Canal nearly as long as the aperture, subconcave lengthwise along its left border, in the same sinistral oblique line as the aperture, wide, open, scarcely notched. Ornament, curved longitudinal rust-brown streaks on the summit of the costae, sometimes broken into dots on the spiral lira; at irregular distances on the body-whorl, and slightly sigmoid ; crowded into a rusty area on the varix of the notch. Total length, 51,5 mm.; greatest diameter, 19,5; length of aperture, 15,5 ; width, 6,5 ; length of canal, 11 mm.

L. walkeri of J. C. Melville, Proc. Malac. Soc. Loncl., 1895, vol. I., No. 5, p. 221, pi. xiv., fig. 9, from Cossack, W. Australia, approaches it, but that shell is smaller, length 25 mm., more solid, costae about half as numerous and more valid, suture not marginate, aperture with a distinct continuous inner lip, a thick everted or bevelled outer lip, and a more abrupt origin of the canal from the aperture.

Western Australia.