Shell up to 12.0 mm in length, elongate-ovate, solid, body whorl frequently broad, teleoconch of 5%-6% convex whorls, protoconch of 1% smooth, glassy embryonic whorls; sculptured with strong, broad and rounded axial ribs, ribs becoming more slender and numerous on the dorsal side of the body whorl; spiral sculpture consisting of short spiral grooves in moderately narrow interspaces, 5-6 grooves towards the base continuous, a deep, wavy subsutural groove gives rise to strong sutural nodules. Aperture narrow, outer lip thickened and variced and with 5-9 small denticles within, col- umellar callus narrow, laminated basally and with 3-5 small denticles anteriorly, siphonal and anal canals distinct. White in colour, usually with an interrupted reddish-brown peripheral line on body whorl, some specimens irregularly maculated with reddish-brown on the dorsal side, columellar callus and aperture white. Operculum brown and serrate at margins. TYPE LOCALITY. Shark's Bay, southwest Australia. DISTRIBUTION. Western Australia. On sand-bars, intertidal. Type specimens. Syntypes of N.albinus (Thiele) are in the Zoological Museum, Humboldt Universi- ty, Berlin, and the illustrated syntype measuring length 10.5 mm, width 6.5 mm, is here selected as the lectotype (pl.16, fig.11). Material examined. AUSTRALIA: Western Australia: S.W. of Northwest Cape; Shark Bay; N.of Dampier (all coll.Hansen); Roeburn (Natal Mus.); 27 km S. of Exmouth town, Exmouth Gulf; Point Cloates lighthouse beach, Northwest Cape; Denham, Sharks Bay; Monte Bello I; Bandicoot Bay, Barrow I, 20°52'S & 115°19'E; E.side of Exmouth town (all AMS). The species is closely similar to N.sinusigerus (A.Adams), and differs only by the slightly wider axial ribs and body whorl, and more importantly, by the presence of a 1½ whorled non-carinate protoconch.