Amastra eos

The length of the shell attains 12.4 mm, its diameter 8 mm.

(Original description) The thin shell is perforate and globose-conic. It has a chestnut-brown coloration that deepens along the suture, while the base is paler, often marguerite yellow near the axis. The surface is slightly lustrous, finely and irregularly striate, and lacks spiral lines. The apical whorls are smooth, with the spire displaying straight outlines above and convex contours below. The whorls are strongly convex just below the suture. The outer lip is thin, and the columellar lamella is also thin and moderately oblique.

The color division on the body whorl is typically distinct and abrupt in immature shells. However, in mature specimens, the colors tend to blend, although the bipartite pattern remains discernible upon close examination.^[2]

This species is endemic to Hawaii and occurs on Oahu Island.

• Cowie, R. H., Evenhuis, N. L. & Christensen, C. C. (1995). Catalog of the native land and freshwater molluscs of the Hawaiian Islands. vi. Leiden: Backhuys Publishers. p. 107.{{cite book}}: CS1 maint: multiple names: authors list (link)