Shell rather thin, small, generally not exceeding 15 mm. in length, depressedly conical. Apex situated at the anterior third of the shell. Basal margin the same width at both ends, elliptical. the sides subparallel and a little raised in the middle so that the shell rests upon its ends. Front slope slightly concave, back slope convex. Orifice narrow and trilobated. with its posterior wall at the apex. Sometimes it is stained with black. Surface of shell shiny, sculptured with numerous rounded, subequal, radiating ribs, crossed by concentric raised threads which produce a beaded surface. Color oyster-white with numerous black or dark brown lines, generally arranged in seven or eight streaked rays, which form triangles in shape. Margin very finely crenulated. Interior color of shell a polished oyster-white, the color rays of the outside showing through. Internal callus of the orifice the same color as the inside, frequently bounded by a black streak.

This small, pretty species is rare and so far as known rather restricted in its range. As the records indicate below, the specimens from Florida occur mainly in fairly deep water. Bahama specimens were found under rocks in rather exposed places and washed up on the beaches.

Florida, the Bahamas and south through the Greater and to the northern Lesser Antilles.