76 CERNOHORSKY 
Subgenus Nebularia Swainson, 1840 
Nebularia Swainson, 1840, Treat. Malac. pp. 130,131,319. Type species by SD (Herrmannsen, 
1847) Mitra contracta Swainson, 1820. Recent, Indo-Pacific. 
Mitra (Nebularia) boucheti sp. n. (Figs. 1-4) 
Shell small in size, up to 10.8 mm in length (range of adult specimens 7.7 mm — 
10.8 mm), fusiformly-elongate, width 36% — 40% of length, teleoconch of 54% — 5% 
weakly convex whorls, protoconch multispiral, conical, consisting of 3 + glassy, 
smooth embryonic whorls, sutures narrowly canaliculate. Regularly sculptured with 
small, rounded, uniformly sized, close-set nodules which are arranged in 24-31 axial 
rows and 5-6 spiral rows on the penultimate and from 27-39 axial rows and 11-12 
spiral rows on the body whorl, siphonal fasciole with 5-7 oblique cords. Interspaces 
between nodules very narrow, moderately deep and pitted. Aperture about equal in 
height to the spire, height 48% — 51% of length, narrow, edge of outer lip thickened 
and crenulate in adult specimens, perpendicular but constricting towards siphonal 
canal, columella calloused and with 4 strong oblique folds which decrease in size 
anteriorly. Base colour white, ornamented with irregular orange-brown zones, sutures 
occasionally with a few wide-spaced orange-brown spots, anterior third of body whorl 
with a continuous or interrupted broad orange-brown band, interior of aperture with 
2 brown and | white. 
TYPE LOCALITY. Station DC41, Reunion Island, Indian Ocean 21°21’°S & 55°27°E, 
75 m. 
Holotype. Museum National d’Histoire Naturelle, Paris (no number), length 9.2 mm, 
width 3.5 mm, height of aperture 4.7 mm (Figs. 1,2). 
Paratypes. Paratypes from the type locality in the Museum National d'Histoire 
Naturelle, Paris, and the Auckland Institute and Museum. A total of 12 specimens 
have been examined. 
Mitra (Nebularia) boucheti superficially resembles M. (N.) suturata Reeve, 1845, 
but adult specimens of the latter range in size from 20.0 to 40.0 mm, the sculpture 
consists of spiral cords with narrow pitted interpaces and overriding longitudinal 
striae, and the protoconch has only 114-2 embryonic whorls (3 + in M.boucheti). 
The species is named for Dr P. Bouchet, Museum National d’Histoire Naturelle, 
Paris, a member of the “Marion-Dufresne” 1982 expedition, for his malacological 
contributions on Mediterranean-Atlantic Mollusca. 
Family COSTELLARIIDAE 
Genus Vexillum Roding, 1798 
Vexillum Roding, 1978, Mus.Bolten. p.138. Type species by SD (Woodring, 1928) V.plicatum 
Roding, 1798 = Voluta plicaria Linnaeus, 1758. Recent, Indo-Pacific. 
