This two inch chiton has a medium wide girdle which is smooth and spongy appearing but has sparse glassy hairs which are covered with many short tight recurved spines. The mucro is median and depressed. The jugum has many faint ridges which become obsolete in older specimens. The central area of the valves is smooth and the lateral area faintly defined by being slightly raised. The most conspicuous characteristic of this species is the lack of heavy sculpture and what appears to be growth marks causing a concentric pattern. The head valve has slightly raaised radiating sculpture. The color if the shell is chocolate brown with green mottling. Some specimens have green lines zigzagging across the lateral areas. The color of the girdle is gray and white blotched. (Syn: Mopalia laevior Pilsbry, 1918)
Illustrated specimen from Burghardt Collection