Niu, Oahu, 8 feet, 61mm

Kaneohe Bay, Oahu, 3 feet, 59mm

Makua, Oahu, 25 feet

Locally common in shallow water.  Duplicaria costellifera has shorter whorls, stronger ribs, and occurs in deep water.  Attains 4 inches, 100mm.  Endemic to Hawaii.  Formerly known as Duplicaria gouldi and Terebra gouldi.