Hepingdao, Keelung City, 30 Jul 2008: 16 specimens (BD 18.42-24.92 mm) (CEL- BB-12).
Shell with 8 plates, base membranous; orifice triangular. Scutum and tergum fused. Maxilla triangular; maxillule not notched; mandible with 3 teeth; mandibulatory palp elongated, with setae on inferior margin; labrum concave with blunt teeth.
Coloration.—Shell white but shell surface often covered by algae that can mask the color of the shell.
BD to 30 mm.
On low shores of exposed intertidal rocky shores.