= Cyclostrema micra, Petterd, Journ. Conch., p. 139, 1884 (non C. micra. Ten.-Woods, 1877).

Shell minute, planorbiform, very widely umbilicated, sordid-white : spire slightly sunken. Whorls four, rapidly increasing, convex; last whorl with a sloping sutural margin ; the ornament consists of close-set, slender, oblique growth-lines only; base convex, abruptly bounding the wide umbilicus, which exposes all the whorls. Aperture incomplete, nearly circular, a little wider than high ; outer lip sharp, ecurved medially.
Dimensions of figured specimen. Minor diameter, 1,1; major diameter, 1,84; height, 0,5 mm.
Habitat.—Tasmania (Petterd); South Australia (Dr. Verco).