Nassarius (Zeuxis) bicallosus (E.A.Smith, 1876) (Plate 26, figs.8-11) 1876. Nassa bicallosa E.A.Smith, J.Linn. Soc. Lond. 12:543, pl.30, fig. 1; 1959 Barnard, Ann.Sth. African Mus. 45:107,fig.22h (radula), fig.23d (protoconch); 1973 Kensley, Sea-shells Sth. Africa p.160, fig.588. 1877. Nassa glabella Marrat, Prop.new forms genus Nassa, p.3,pl.1, fig.7. 1877. Nassa laevigata Matrat, ibid., p.3 (nom.subst.pro N. glabella Marrat, 1877) [non N. laevigata Pusch, 1837]. 1916. Arcularia bicallosa Smith, Hedley, J.R.Soc. West Australia 1:61. 1928. Nassarius bicallosus (Smith), Tomlin, Ann.Sth. African Mus. 25(2):314; 1982 Kaicher, Card cat.world- wide shells, Pack No.31:card 3150. 1969. Nassarius (Nassarius) coronatus philippinensis Shuto, Mem.Fac. Sci. Kyushu Univ. (D), Geol. 19(1):130, pl. 12, figs.5-7, textfig.28. 1972. Nassarius (Zeuxis) bicallosus (E.A.Smith), Cernohorsky, Rec.Auckland Inst. Mus. 9:170,fig.99 (radula), figs.119,120 (shell). Shell up to 28.0 mm in length, almost ovate, body whorl occasionally inflated, teleoconch of 6-7% convex whorls, protoconch of 3-3% glassy, embryonic whorls, last whorl finely carinate but most specimens worn smooth, sutures on spire whorls tight, body whorl suture narrowly ledged or slightly canaliculate, especially on the dorsal side; post-embryonic whorls sculptured with axial riblets and a row of sutural nodules, last 4-4% whorls with only a sub-sutural groove and short axial riblets or nodes at sutures, subsutural groove obsolete on body whorl; sutural nodes are larger on the body whorl than on spire whorls and number from 10-30 on the penultimate and from 8-17 on the body whorl, in some individuals, however, sutural nodes may become obsolete. Aperture moderately nar- row, outer lip thickened and prominently variced, interior with 11-17 lirate denticles, edge of outer lip bordering anal canal frequently with a spur, anterior edge of outer lip with a few small denticles; columella narrowly calloused and almost fused to the body whorl, prominently concave, anterior recurv- ed towards aperture and sometimes with a blunt, spurlike protrusion, columella with 9-13 aligned denticles which are positioned on a rim, siphonal notch and anal canal prominent. Fawn or bluish- grey in colour, ornamented with darker, underlying bands, interspaces of sutural nodules on body whorl occasionally darker, some specimens uniformly reddish-brown, columella white to cream, in- terior of aperture usually ringed or stained with purple-brown. Operculum brown and either simple, serrate or irregularly jagged at margins. TYPE LOCALITY. West Australia; Swan River; Cape Natal, Sth. Africa (the locality indication on label accompanying the syntypes of N.bicallosus reads "Cape Natal"); none (laevigata Marrat and glabella); Santa Barbara silt, Panay I, Plio/Pleistocene of the Philippines (philippinensis). DISTRIBUTION. From South Africa to India, the Philippines and Northern Australia. On sand-bars, in sand and mud, usually subtidal to a depth of 100 m. Type specimens. Three syntypes of N.bicallosus (E.A.Smith), are in the British Museum (N.H.), Lon- don, No.1876.1.10.29, and the specimen measuring length 21.3 mm, width 11.8 mm, is here selected as the lectotype (pl.26, fig.8). The holotype of Nassa laevigata Marrat, is in the Merseyside County Museum, Liverpool, length 20.4 mm, width 11.0 mm. There are also numerous syntypes of N. glabella Marrat, in the same Institution, and the specimen measuring length 24.6 mm, width 13.4 mm, is here designated as the lectotype (pl.26, fig.9). The holotype of Nassarius philippinensis Shuto, is in the Geology Department, Kyushu University, No.GK-L 7409, length 17.3 mm. Material examined. SOUTH AFRICA: Cape Natal (BMNH); INDIA: Madras (ZSI); INDONESIA: N. of Bali, 7°34'S & 114° 18'E, 100 m (ZMC); Lampong Bay, 5°38'S & 105°17'E, 25 m; Kai-Oerne, Kai Is (all ZMC); PHILIP- PINES: Bohol (ZMC); AUSTRALIA: Western Australia: Broome; Yampi Sound; 3 km E of jetty, Broome (all AIM); Entrance Pt., Broome (USNM); Weld I; Broome, 16 m; Pardoo; Vansittart Bay (all AMS); Onslow; Willy Creek, Broome; Roebuck Bay (all NMV); Dampier Archipelago; near Yardie Creek, W. side of Northwest Cape (both coll. Hansen; Northern Territory: Darwin; Camp Pt., Melville I, N. of Darwin (both AMS); Queensland: Caloundra (coll.Powell); Magnetic 1 (AIM); Yule Pt., N. of Cairns (coll. Whitehead); Gt.Keppel I (coll.Gard- ner); Somerset Bay, Cape York Peninsula; Friday 1, Torres Str. (both AMS). The species is superficially similar to the canaliculate form of N.siquijorensis (A.Adams), but it lacks the numerous fine axial riblets and prominently canaliculate sutures, and has a distinctive sculpture of sutural nodes, columellar denticles which are set in line on an elevated rim, and a strong varix on the back of the outer lip.