Kapoho Pt., Oahu, 1 foot, 12mm

Uncommon under rocks in shallow brackish water.  Attains 1/2 inch.  Known from Reunion, Okinawa, Hawaii, and French Polynesia.  Formerly known as Vexilla fusconigra or Cronia avenacea.  Angiola zonata is a smooth shell common in the same habitat.