Type locality. Indonesia, Tanimbar Islands, N/O "Baruna Jaya 1" KARUBAR stn. CP62, 09°01’S, 132°42'E, 246-253 m. Range and habitat. Off Kai and Tanimbar Islands. Bathymetric range 250-285 m for living specimens. Empty shells between 250 and 288 m. Syntopic with N laevior at stn. CP79 & CP84, with N tarta sp. nov. at stn. DW 62, CP79 & CP84 and with N. intacta at stn CP79, CP83 & CP84.
Description. Shell up to 27 mm in length, thick, solid. Shape broad, semi-pagodoid with short spire. Suture deep. Colour white. Whorls convex, apex eroded, transition from protoconch to teleoconch not traceble. Protoconch of paratype 2 (juvenile) paucispiral, consisting of slightly lesser than 1 whorl, smooth, glossy, rather bulbous, diameter 0.8 mm, transition to teleoconch marked by 1 fine axial thread. First teleoconch whorl eroded. Paratype 2 beginning with 2 strong spiral cords, a third, weak, subsutural spiral cord appearing. Second whorl with 3 spiral cords, interspaces of equal size. Third whorl with 4 spiral cords. Penultimate whorl with about 8 spiral cords, alternating strong and weak, forming big knobs when crossing axials.
Upper teleoconch whorls with about 10 strong axial ribs, running from suture to suture, interspaces of equal size. Penultimate whorl with 19 axial ribs, interspaces narrow. Body whorl with 18 weak axial ribs, interspaces twice as broad. Prelabral varix big, separated from preceding whorl by narrow notch. Aperture ovate, pinched at both ends. Outer lip thick, with 10 internal lirae, edge curled outwards. Columella thin, glossy, with 1 weak abapical spiral fold, spiral sculpture of preceding whorl visible. Siphonal canal short, rather narrow, open. Aperture and siphonal canal about 3/7of total shell length. Periostracum thin, slightly velvety, pale yellowish brown.
Remarks. Nassaria corollaria sp. nov. is characterized by the high number of axials, sculptured with strong knobs, in combination with a rather broad shape.
Paratype 2 is atypical by the secondary spiral cord on the spire which is as strong as the primary. N. incisa has a similar sculpture on the upper spire whorls but differs in having a deep canaliculated suture and a broader interspace between third and fourth spiral cord.
All other Recent and fossil Nassaria species differ in having a lower number of axial ribs, a higher number of spiral cords, and a lesser convex base.

Etymology. Nassaria corollaria sp. nov. is derived from corollarium (Latin, neutrum) meaning "wreath of honour", a kind of crown, which refers to the multiple crowns of knobs ornamenting the shell.