Alvania oldroydae

The length of the shell attains 1.6 mm (0.063 in), its diameter 1.05 mm (0.041 in). (Original description) The minute, yellowish white shell is broadly ovate. The 1½ protoconch whorls are well rounded and smooth. The teleoconch whorls are inflated, weakly shouldered on the posterior fourth between the sutures. They are marked by numerous slender rather closely spaced well-rounded slightly protractive axial ribs, of which 20 occur upon the first, 24 upon the second, and 28 upon the penultimate whorl. In addition to the axial sculpture, the whorls are marked by slender spiral threads which are almost equal to the axial ribs. Of these threads, three occur upon the first and second whorl, dividing the space between the sutures into four almost equal portions, the space at the summit being a little wider than the rest The first spiral thread marks the termination of the sloping shoulder. On the penultimate whorl an additional spiral cord makes its appearance in the space immediately below the summit, a little nearer to the summit than the first spiral cord on the previous whorl. The intersections of the axial ribs and the spiral cords form slender rounded tubercles. …