Nassarius ((Zeuxis) acuminatus (Marrat, 1880) (Plate 27, figs. 4-6) 1880. Nassa acuminata Marrat, Var.shells genus Nassa p. 78; 1938 Tomlin, J. Conch. 21:83, 1911. Nassa (Alectryon) elegantula Schepman, Siboga Exped. 49d:315, pl.19, figs 11a,b. 1966. Zeuxis scalaris A. Adams, Habe & Kosuge, Shells world col. 2:62, pl.22, fig.35 (non Nassa scalaris A. Adams, 1852 - Nassarius). Shell up to 32.0 mm in length, slender elongate-ovate, shining, teleoconch of 6-7 convex whorls which are angulate on presutural ramp, protoconch of 3-34 glassy-fawn, finely carinate embryonic whorls, sutures narrowly canaliculate: sculptured with slender axial riblets which may continue to the body whorl or become obsolete after 2-3 post embryonic turns; in fully ribbed specimens the cen- tral area of the dorsal side of the body whorl is always smooth and is followed by 4-6 crowded ribs on the back of the outer lip; the majority of specimens, however, are smooth on the body whorl, but prominent sutural nodes and feeble axial ribs are in evidence on the penultimate whorl; axial ribs number from 0-25 on the penultimate and from 0-16 on the body whorl; post-embryonic whorls are sculptured with 4-5 spiral striae which render axial ribs nodulose, spiral sculpture disappears on later whorls with the exception of a weak subsutural spiral groove, 7-8 basal cords and 4-5 cords on the siphonal fasciole. Aperture moderately narrow, oviform, outer lip thickened but not varicose, interior with 12-18 denticles, anterior edge of outer lip with a few spinose denticles, columellar callus narrow and usually thinner above parietal wall, columella closely denticulate and wrinkled along its entire length, siphonal notch and anal canal prominent. Shining fawn to light brown in colour, ornamented with 2 narrow, nebulous dark brown bands on the dorsal side of the body whorl, columellar callus and aperture white, interior occasionally brown. Operculum brown, margins serrate or with only 1 denticle on either side. TYPE LOCALITY. None (acuminatus); Madura Strait, Indonesia, 56 m (elegantula). Makassar Straits, Indonesia, is here designated as the type locality (specimens in ZMC and MNHNP). DISTRIBUTION. From India to China and North Australia. In sand, mud, muddy clay and shell-debris, subtidal to a depth of 340 m. Type specimens. The holotype of N. acuminatus (Marrat), is in the Merseyside County Museum, Liver- pool, length 29.7 mm, width 14.0 mm. Several syntypes of Nassa elegantula Schepman, are in the Zoological Museum, University of Amsterdam, and the specimen which appears to be the one originally illustrated, dimensions length 24.3 mm, width 12.7 mm, is here selected as the lectotype (pl. 27, fig. 6). Material examined. INDIA: Bay of Bengal, 20°37'N & 87°33'E, 68m (ZMC); THAILAND: near Chance I, 9°11'36"N & 97°59'24";E, 50 m; Gulf of Thailand, 10°11'N & 101°37'E, 72 m (both ZMC); INDONESIA: bet- ween Sumatra and Java, 5°22'S & 105°44'E, 30 m; Amboina Bay, 92 m; N. of Bali, 8°26'S & 114°29'E, 70 m; Macassar Str., 1°25'S & 117°05'E, 50m; Java, 8°26'S & 114°29'E, 70 m (all ZMC); Jamdena Strs., E. of Wotap I, Tanimbar, 64-73 m; Teluk Dodinga, near Ternate, Halmahera, 46-62 m; 11-19 km W. of Toba I, N. end of Aru 1, 64 m (all WAM); Makassar, 1°27'S & 117°02'E, 51-54 m; 1°09'S & 117°08'E, 25 m; 1°08'S & 117°18'E, 49 m (all MNHNP); PHILIPPINES: 26 km N.E. of Port Banga, Mindanao, 73 m; 10 km off Port Banga, Min- danao, 49 m (both ZMC); off Pitage, Luzon; Daram Channel, W. Samar, 48 m; N. of Marinduque, 92 m; off- Tayabao, Luzon, 165 m; Subic Bay, Luzon, 60 m; off Badian, I, W.Samar, 60 m; E. of Siquijor; off Polloc, Mindanao, 51 m; off San Fernando, Luzon, 340 m (all USNM); Batangas; Punta Engano, Mactan I, Cebu (both coll. Dan); CHINA: N.W. of Pratas I, China Sea, 62 m (USNM); off Hong Kong (AMS; USNM); PAPUA NEW GUINEA: Laing I, Hansa Bay, 35 m (coll. Tursch); AUSTRALIA: Northern Territory: 91 km N. of Croker 1, 10°15'S 132°54'E, 70 m; Arafura Sea, N. of Croker 1, 10°17'S & 132°38'E, 65 m and 9°30'S & 131°51'E, 146 m (all AMS).