Ventral face of valve iv. Length of chiton 32 mm when live. LWS. Isle of Lewis, Scotland. April 2018. Leg. D.M. McKay & S.Taylor.
Lower layer of shell, ‘articulamentum’, is of white aragonite, sometimes with a yellow jugal tract.
The wide curved apophyses (1) are separated by a narrow, straight, jugal sinus (gap) (2) that is less than 25% width of an apophysis.
Insertion plates (3) on the ends of valves ii – vii, which are embedded in the girdle, are separated by a single slit (4).

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