Cleotrivia globosa
(Gray in G. B. Sowerby II, 1832)
Shell globular, ends slightly extended, spire concealed, aperture almost semicircular. Covered with strong ribs, about 27 on the outer lip, interrupted by a deep dorsal groove, which extends almost the whole length of the shell. Fossula deep, crossed by ribs, extending as a broad groove within the aperture for whole length of shell. Colour white.
Size: Length up to 7 mm
https://seashellsofnsw.org.au/Triviidae/Pages/trivia_globosa.htm
