Eostrobilops hirasei

The shell is rather depressed, with dome-shaped spire, the periphery mainly rounded but indistinctly subangular in front of the aperture, the base rather strongly convex. The umbilicus is small, widened in the last half-whorl, contained about 5+1⁄2 times in the diameter of shell (in some examples smaller, 6 times or 7+1⁄2 times in diameter). Opaque, cinnamon-brown, without much gloss, smoothish, with low growth-wrinkles. Whorls are strongly convex and increase slowly. The aperture is oblique and lunate, peristome russet, expanded and well thickened. The parietal callus is moderately heavy. The parietal lamella is rather strong and emerges to the edge of the callus. The infraparietal lamella is relatively strong though much lower than the parietal, and emerges nearly to the edge of the parietal callus. Both lamellae penetrate inward about one-third of a whorl, being conspicuously nodose at the edges, and there is a very weak continuation to about half a whorl inward. At a point about one-fourth of a whorl inward there is a low, short and blunt columellar lamella and two short basal folds. All or part of these are visible in an oblique view in the aperture, but owing to the opaque texture of the shell they are not visible through the base in specimens examined.^[3]

The height of the shell is 2.1 mm.^[3] The width of the shell is 3 mm.^[3] The shell has 5+1⁄3 whorls.^[3]

The height of the shell of the type specimen is 2.2 mm.^[3] The width of the type specimen is 3.2 mm.^[3] The type specimen has 5+1⁄2 whorls.^[3]

This relatively large, solid species and it is distinguished from the Eostrobilops coreana and the Eostrobilops nipponica by the number of internal basal plicae (two).^[3] The growth wrinkles or striae are rather fine and somewhat sharp below the suture, but are not regular in development in the peripheral and basal parts.^[3]

This article incorporates public domain text from the reference.^[3]