Shell ovate, gibbously elevated, anteriorly much inclined, slightly hooked, thickly latticed throughout with strong narrow radiating ridges and raised concentric striae, orifice elongately oblong, sides excavated in the middle; greenish-white, sprinkled with dots and blotches of olive-green, bluish round the orifice. An extremely characteristic species, much elevated and curved anteriorly, with the same narrow oblong orifice mostly seen in the flat species.