Opisthostoma michaelis van Benthem Jutting, 1952  

By van Benthem Jutting (1952)

"shell short-cylindrical, white. First whorl smooth, subsequent ones ornamented with fine white transverse ribs, closely placed on the upper whorls, but more distantly on the last one. A little shinning and transparent. No spiral striae discernible. Whorls 4, convex. Topwhorl placed obliquely on the axis of the shell. First two whorls lying in one plane. Last whorl ratehr small, placed obliquely under the preceding one, so that the shell becomes narrower towards the base. About midway constricted transversely, then widening again and twisted upward and a little backward. Adnate. Umbilicus open, but not wide. Suture deep. Aperture round, directed obliquely up and back. Peristome continuous, circular or rounded-triangular, duplex. Reaching somewhat over halfway up the height of the penultimate whorl. Operculum unknown."