Mastoniaeforis chaperi Jousseaume, 1884 (Fig. 41)

Mastoniaeforis chaperi Jousseaume, 1884: 243, pl. 4, figs 4-5.

TYPE LOCALITY. — La Réunion.

TYPE MATERIAL. — Syntype. La Réunion • MNHN-IM-2000-478; 1 specimen; from type locality.

ORIGINAL DESCRIPTION. — Testa solida, fusiformi, alba ad basin lutea; anfractibus 12-14, subregulariter crescentibus (primi laevigati, pallide luteo-tincti, sequentes seriebus tuberculorum biseriatim dispositis ornati), sutura lineari, interstitiis minore, separatis; ultimo valde attenuato, luteo, seriebus tribus tuberculorum ornato, ad latus sinistrum et prope suturam tubifero; apertura parva, ovata, canali brevi, ascendente, unicarinato, luteo, munita. — Long. 4 millim., lat. 1-5 millim. [Latin diagnosis followed by a discussion in French]

TRANSLATION OF THE LATIN TEXT. — Solid shell, fusiform, white, yellowish at the base; from 12 to 14 whorls, slightly regularly growing (first whorls are smooth, coloured in light yellow, subsequent whorls are adorned by two series of tubercles) and separated by a linear suture which is narrower than the interspaces; the last whorl is strongly attenuated, yellow, adorned by three series of tubercles, tubular near the suture and on the left side; small aperture, ovate with a short, ascending, unicarinated and yellow siphon. — Length 4 mm, diameter 1-5 mm.

DIAGNOSIS. — Shell cyrtoconoid. Syntype 3.9 mm high.Teleoconch of c. 9.5 whorls.Two spiral cords present of which the first becomes more prominent towards the last whorl. Both cords with tubercles at the intersection with prosocline axial ribs. Posterior sinus well developed and protruding into a short canal. Base with two additional spiral cords of which the first tubercled and the second smooth.Teleoconch whorls white, the last whorl and the base brown. Siphonal canal white. Protoconch missing in the syntype.