Disarticulated valves, ventral surface. Length of live animal 14.5 mm. North Yorkshire. September 2014. (leg. Paula Lightfoot).
Valves numbered head to tail as i-viii.
1: single slit in insertion plate at end of slit ray on intermediate valve.
2: eight slits in insertion plate at end of slit rays on head valve (i).
3: ten slits in insertion plate on tail valve (viii); central area worn so slits indistinct, but number ascertained by counting slit rays.

Slit formula of this specimen: 8/1/10. (Matthews stated 8/2/2/2/2/2/2/9 to10 as she counted slits on both sides of intermediate valves.)

KEY ID FEATURES and similar species at: 01 Boreochiton ruber. Length 12mm. North Yorkshire. September 2014. (leg. Paula Lightfoot).