Shell like a Lacuna, obliquely ovate, the lateral outline subrhomboid, translucent, amber-brown, the spire produced, apex obtuse, whorls 4,5, the third swollen, with four shallow grooves, the posterior one only much impressed, but vanishing on the last whorl; body with irregular lines of growth, undulating across the groove; numerous scattered impressed points; aperture ovate, the outer lip acute, purplish, with a double callus, within slightly tuberculate at the middle; columellar lip white, callus expanded in the plane of the aperture; its inner margin subvertical, with two subacute teeth, the upper largest; a thin callus expanded over the inner wall, and crossing half the width of the aperture; intervals between the teeth and walls equal. Long., 0.32 inch; lat, 0.22 inch. (equals long., 8; lat, 5 mm.). (Cooper.)

San Pedro, California, to Gulf of California.