C. VlLVENS 
Seguenzioidea and Trochoidea from French Polynesia 
150°38'W, 493-540 m, 2 dd. - Stn DW3434, 16°42'S, 
151°03'W, 700-785 m, 1 dd sub. - Stn DW3481, 
17°29'S, 149°45'W, 610 m, 1 dd, 2 dd juv. 
Distribution. Hawaii, India, Marshall Islands, 
subtidal (Kay, 1979; Severn, 2011); French Polynesia, 
Société Islands, 540-914 m (dead); French Polynesia, 
Australes Archipelago, intertidal (living), 0-24 m 
(dead) (Letourneux et al., p.c.). 
Herpetopomapoichilum n. sp. 
Colour Figs G1-G2, Figs 16-19, Table 2 
Type material. Holotype (3.1 x 2.5 mm) MNHN 
(24966). Paratypes: 4 MNHN (24967, 24968). 
Type locality. Société Islands, Tahiti, TARASOC, stn 
DW3504, 17°37'S, 149°38'W, 455-650 m. 
Material examined. French Polynesia, Société 
Islands. TARASOC: stn DW3425, 16°43'S, 
151°03'W, 557 m, 1 dd juv. - Stn DW3434, 16 0 42’S, 
151°03'W, 700-785 m, I dd. - Stn DW3457, 16°45'S, 
151°24'W, 520-572 m, 1 dd (paratype). - Stn 
DW3460, 17°28'S, 149°50'W, 660-680 m, 1 dd, 1 dd 
sub, 4 dd juv. - Stn DW3476, 17°29'S, 149°45’W, 
435-490 m, 1 dd sub. - Stn DW3481, 17°29'S, 
149°45'W, 610 m, 4 dd (with 3 paratypes), 3 dd juv. - 
Stn DW3484, 17°47S, 149°23'W, 300-650 m, 1 dd 
juv.-Stn DW3498, 17°43'S, 149°17'W, 347-460 m, 3 
dd. - Stn DW3504, 17°37’S, 149°38'W, 455-650 m, 1 
lv (holotype). 
Distribution. French Polynesia, Société Islands, alive 
in 455-650 m, shells in 460-700 m. 
Diagnosis. A small white Herpetopoma species with 
an elevated, more or less conical spire and a rounded 
periphery, 5 granular spiral cords on last whorl, 
peripheral cord smaller than the other cords, a convex 
base with 5 spiral cords and a closed or very narrow 
umbilicus. 
Description. Shell of small size for the genus (height 
up to 4.8 mm, width up to 4.3 mm), higher than wide, 
rather thiclc, conical; spire elevated, height l.lx to 
1 2x width, 2.5x to 3.4x aperture height; umbilicus 
closed or reduced to a thin slit. 
Protoconch more or less 200 pm, of about 1 whorl, 
with fine granules, with a thin terminal varix. 
Teleoconch up to 5.1 convex whorls, bearing 5 spiral 
granular cords similar in size except peripheral smaller 
on last whorl; nodules from cords at intersections with 
strong axial prosocline ribs. Suture visible, weakly 
canaliculated. 
First whorl convex, sculptured by about 20 slightly 
prosocline smooth, rather strong ribs; interspace 
between similar in size to ribs; primary cords PI, P2, 
P3 and P4 appearing at end of whorl, granular, closely 
packed, similar in size except PI smaller. On second 
whorl, P3 slightly stronger than other cords, PI still 
smaller; beads of ail cords stronger, rounded, 
connected by axial ribs. On third whorl, ail cords 
similar in size, except PI smaller; distance between 
cords smaller than cords; strong axial ribs visible in 
interspaces, connecting beads of spiral cords. On 
fourth whorl, ail cords more or less similar in size; 
axial ribs enlarging, still strong, more prosocline. On 
last whorl, P5 visible, slightly smaller than other 
cords; distance between cords still smaller than cords. 
Aperture almost circulai” outer lip thickened, with up 
to 9 inner lirae (eroded on dead specimens), lira the 
closest to columella stronger and producing a denticle. 
Columella straight, almost vertical, with a basal tooth. 
Base convex, with 5 subgranular to granular, similar 
in size spiral cords; distance between cords smaller 
than cords; axial ribs between spiral cords very 
visible. 
Umbilicus close or reduced to a small chink. 
Colour of teleoconch and protoconch white to 
yellowish white. 
Colour plate 1. Holotypes MNHN of the new French Polynesian species described. 
Scale bar: 5 mm. 
Al-2. Calliotropis ammos n. sp., Tuamotu Archipelago, 887-890 m, 22.4 x 22.7 mm; Bl-2. Gaza polychownos 
n. sp.. Société Islands, 580-618 m, 14.5 x 18.4 mm. 
Scale bar: 1 mm. 
Cl-2. Calliostoma (Fautor) leptor, n. sp., Tuamotu Archipelago, 315-340 m, 12.6 x 10 8 mnr Dl-2. Thalotia 
polysarchosa n. sp.. Australes Arch,pelago, 100 m, 4.5 x 4.0 mm; El-2. Thalotia khlimax n. sp.. Australes 
rc ipelago, deep water, 6.2 x 5.1 mm, Fl-2. Thalotia tiaraeides n. sp. Australes Archipelago, 500 800 m, 6.4 x 
0.4 mm, Gl-2. Herpetopoma poichilum n. sp. Société Islands, 455-650 m, 3.1 x 2.5 mm 
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