Shell minute, thin. Whorls six, including the nucleus. Nucleus one turn and a half, smooth, with deep impressed suture, apex exserted. Spire-whorls sloping, nearly straight, gradated, angled at junction of posterior and middle fourth ; behind this the whorl is bevelled to the suture, which is distinct and impressed. Whorls sculptured with spiral lirae, four to six in front of the angle, two behind it, flatly rounded, equidistant, wider than the interspaces. Longitudinal line numerous, equidistant, about 20 in the penultimate whorl, narrower than the interspaces ; in some specimens crossing the spiral lirae and wider than them, generally most marked and forming conspicuous costae in the second and third spire-whorls; in others narrower, crossed by the spiral lirae, giving a cancellated appearance. Body-whorl nearly cylindrical, angled a little below the suture and again at the periphery, below which it is excavately contracted to the base ; provided with spiral lirae, two behind the upper angle, about seven between the angles, and nine or ten below, the most valid forming a minute carina at the lower angle, crossing or crossed by 18 to 20 wider or narrower longitudinal lirse continued to the base, though less conspicuous here. Aperture elongately rhomboidal; wider anteriorly. Outer lip simple, thin, crenulated, with a well-marked semi-circular sinus from the posterior angulation to the suture, lip slanting obliquely from the carina to the anterior notch. Columella straight, inner lip inconspicuous except behind, where there is a columellar callus, from which springs the acute upper boundary of the sinus. Notch simple, anterior extremity truncated obliquely to the left. Ornament uniform, rusty-brown or white. Length, 45 mm.; breadth, 1,25 mm.
Habitat: Backstairs Passage, 14 dead.
Diagnosis: I know no Drillia with an approximate form.

Southern Australia