Reeve (1864) descriptions on Pterocyclos euryomphalus – “Shell very widely very openly umbilicated, flatly discoid, fulvous, sharply waved throughout with chestnut, spire rather immersed, whorls narrow, roimded, flnely striated, last whorl with a small recurved tube at some distance behind the aperture; aperture obliquely circular, lip duplicate, thinly tumidly dilated at the upper part. Very slenderly discoidly coiled, with a crowded painting of sharply zigzag chestnut streaks.”

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