Diameter of holotype 1.74 mm.

Type material. Holotype SMNH 4346 and 1 para type , SMNH 4347, 4 paratypes in MNHN.
Type locality. Corsica, outer part of Baie de Calvi, 90-120 m, on a bottom largely consisting of old Posidonia fibres, 6 specimens and shells.

Material examined. The types and ~ Tuscan Sea, 400 m depth, on sunken drift wood, 3 specimens, coll. CARROZZA.

Description. Shell small, transparent, fragile, Planorbis-like. Larval shell of 1.25 distinctly hypertrophic whorls, initial part weakly sculptured with irregular, sharp, very short, randomly dispersed ridges. Adult teleoconch of 2 -.3 whorls, sculptured only by weak incremental lines. Whorls connected only for a very short distance, more or less at the periphery of the preceding one. Suture consequently deep and channeled. Cross-section of whorls rounded triangular, adapical side slightly flattened and sloping outwards from centre, abapical side also flattened, periphery of whorls well below mid-height. Whorls coiled with upper surface at approximately same level or with earlier whorl lower. Last whorl overlaps preceding whorl, measured on underside, corresponding to 1/8 - 1/10 of width of earlier whorl. Periostracum thin, slightly lamellose, brownish.
Dimensions. Diameter of holotype 1.74 mm. Radula. Not examined.

Type locality. Corsica, outer part of Baie de Calvi, 90-120 m, on a bottom largely consisting of old Posidonia fibres, 6 specimens and shells.
Also: Tuscan Sea, 400 m depth, on sunken drift wood, 3 specimens.