Shell size to 65 mm; selatively heavy, trapezoidal, with truncated posterior margin. Sculpture of commarginal ridges bearing fine, evenly spaced radial lines that give ridges a crenulated aspect. Pallial sinus moderately deep. External color whitish, often mottled with light brown. This species is not commonly found in SW Florida. Single lot from Sanibel in BMSM collection dates from 1957.