Amastra subcrassilabris

The shell is perforate, acutely ovate, solid and lacks a glossy surface.

The spire's outlines are straight or only slightly contracted near the summit, with nearly flat whorls.

The body whorl is spirally malleate below the periphery in the type specimen, though smooth in another example.

The body whorl is cream-white, occasionally retaining small patches of a thin brown cuticle.

[2] This species is endemic to Hawaii, occurring on Maui Island.