Diagnosis. Moderately large chitons, 25-35 mm; uniformly brown in color, valves strongly "false beaked" (juga forward projecting); girdle with scattered, sharp spicules. Habitat Lives at 20-467 m on rocky and coral/sponge bottoms. In the northern extreme of its range this species lives on vertical rock walls with abundant sponges and corals at depths of 20-35 m.
Distribution. Vancouver, British Columbia to the Sea of Cortez.
Occurrence. Very rare, known so far in the Salish Sea from only two specimens (leg. Robert & Tammy Forsyth, 1995).