Marmorofusus gen. nov. Fusinus auctt.; [non Rafinesque, 1815, type species Murex colus Linnaeus, 1758]. Type species: Syrinx nicobarica Röding, 1798, Recent, west- ern Pacific, designated herein. Diagnosis. Fusinine shells of medium to large size (to nearly 190 mm SL), fusiform, with moderate to tall spire, generally angled whorls, and long, slender siphonal process. Axial sculpture of low ribs, sometimes expressed as nodes or knobs, most prominent at peripheral angle; spiral sculpture of large broadly rounded cords, often flattened on sutural ramps. Exterior shell color white or cream marked with solid or inter- rupted darker axial streaks or spots. Radula (Pl. 1, Fig. 2) formula 1.1.1. Rachidian subtriangular, widest anteriorly, with 3 slender, sharply pointed cusps, sometimes flanked by single shorter cusp on each side. Lateral teeth wide, base arched; cusps numerous (9-13 in 2 species examined), straight, slen- der, pectinate, sharply pointed, arrayed fan-like, longest at center, lengths diminishing toward lateral margins; outermost 2-3 cusps stouter, blade-like, slightly curved toward center; single tiny cusp at inner edge, sometimes another at outer edge. Etymology. The generic name is composed of marmor, Latin for marble, and the suffix -fusus, a masculine noun meaning spindle; literally, the marbled spindle. Remarks. We compared SEM photomicrographs of the radula with other accounts of the radula of M. nicobaricus (Habe, 1945; Maeda, 1992) and with descriptions and illustrations of radulae of 79 other species of Fusininae in published literature. Those species comprise eight fusinine genera: Fusinus Rafinesque, 1815 (43 spp.); Amiantofusus Fraussen et al., 2007 (1 sp.); Angulofusus Fedosov & Kantor, 2012 (1 sp.); Aptyxis Troschel, 1868 (1 sp.); Chryseofusus Hadorn & Fraussen, 2003 (16 spp.); Granulifusus Kuroda & Habe, 1954 (13 spp.); Sinistralia H. & A. Adams, 1853 (2 spp.); and Viridifusus Snyder et al., 2012 (1 sp.), including the type species of the last seven genera. Radulae of M. nicobaricus reported by Habe (1945: text- fig. 10) and Maeda (1992: 92) are in agreement with our description. Habe figured a fan-like array of 11 lateral cusps plus single tiny cusps at inner and outer margins, and Maeda. reported 12 lateral cusps; Habe also depicted only 3 cusps on the rachidian tooth. We believe differences between their counts and ours to be related to sizes of animals from which they were taken; some Fusinus species add cusps to lateral. teeth as they grow (Barnard, 1959: figs. 19-j). Another species that we place in Marmorofusus has a radula similar to that of the type species. Von Martens (1874) urged study of the radula of the type species of Fusus (= Fusinus) as a matter of high priority for understanding relationships among Fusininae. Barnard (1959: 92) later described the radula of a South African species he called Fusus colus, but true F. colus is not present in South African waters. We believe the radula he described was of the similar F. gracillimus (Adams & Reeve [in] Reeve, 1848).. sometimes considered a synonym of F. colus. Because of the similarity of their shells, we use the radula of F. gracillimus as a surrogate for that of F. colus. The adult radula that: Bernard described has a subtrigonal rachidian with 3 very small cusps and wide laterals bearing about 10 rather short.. subtriangular, sharply pointed cusps, with single tiny addi- tional cusps at lateral edges. The lateral cusps resemble those figured for other Fusinus species more than they do the comb- like and blade-like cusps of Marmorofusus gen. nov. species. Marmorofusus radulae do not much resemble those of any of the other fusinine genera either, leading us to propose that the radula may be a diagnostic generic feature for this group.