Shell large to very large, solid and heavy with rectangular-ovate shape. Sculpture consists of approximately 38 smooth and slightly rounded radial ribs with moderately narrow interspaces. Color externally whitish and spotted with brown, internally white with strongly crenulate inner margin. Distribution: Vung Tau, Khanh Hoa, Ninh Thuan, Binh Thuan, Binh Tuy, Long Hai, Hochiminh City, etc. Size: 50-70 mm.