Miniscule urchin test (?)

Miniscule urchin test (?)

Observation - Miniscule urchin test (?). Description: Found washed up on a Scottish beach. 3mm x 2mm (biro nib for comparison). If its possible someone can make an i.d. for me, that would be great.

Found washed up on a Scottish beach. 3mm x 2mm (biro nib for comparison). If its possible someone can make an i.d. for me, that would be great.