Live occupied shells with body entirely retracted. Some sources incorrectly say animal is incapable of complete withdrawal.
1: sculpture of distinct transverse growth lines and many spiral striae form lattice of oblongs.
2: growth lines and suture with debris lodged against them.
3: pale looped intestine discernible through translucent shell as strongly illuminated by camera flash.
Shell lengths 2 mm & 2.3 mm. North Yorkshire, September 2014. (leg. Jan Light.)

02 Otina ovata