Shell up to 23.0 mm in length, elongate-ovate, solid, teleoconch of 6½-7 weakly convex whorls, protoconch of 3 glassy embryonic whorls, sutures tight; sculptured with distinct axial ribs which number from 18-23 on the penultimate and from 20-30 on the body whorl; spiral sculpture consists of spiral striae which either touch the walls of the axial ribs or override these, striae number from 4-6 on the penultimate and from 14-15 on the body whorl, last 5-6 striae becoming somewhat stronger and nodulose towards the base of the body whorl. Aperture moderately narrow, outer lip thickened but not strongly varicose, interior with 8-9 lirate denticles, columella narrowly calloused and with 9-11 denticles, parietal denticle distinct, siphonal notch and anal canal prominent. Uniformly creamy-white to brown in colour. Operculum serrate at margins according to Barnard (1959). TYPE LOCALITY. Mouth of Tugela river, South Africa, 84 m. DISTRIBUTION. South Africa. In mud and sand, subtidal to a depth of 100 m. Type specimens. The holotype of N.eusulcatus (Sowerby), is in the British Museum (N.H.), London, No.1902.5.28.64., length 19.3 mm, width 9.6 mm. Material examined. SOUTH AFRICA: Durban, Natal, ex-pisces: between Umkomaas and Port Edward, ex- pisces (both Natal Mus.). The species is hardly separable from the axially ribbed form of Nassarius castus (Gould), however, insufficient material has been seen to place it unequivocally in synonymy. Typical specimens of N.castus have also been seen from Natal.