Small millipede

Small millipede

Observation - Small millipede. Description: 7 mm long. It did not roll up into a ball when disturbed. Would be grateful for help with identifcation, please. The key appears to be out of print!

7 mm long. It did not roll up into a ball when disturbed. Would be grateful for help with identifcation, please. The key appears to be out of print!