Pale snails

Pale snails

Observation - Pale snails - UK and Ireland. Description: Very numerous small snails, shells from 2-3mm to ~15mm across. Found on wet pavement after early morning rain, between marsh nature reserve and urban scrubland. Some entirely white-shelled, pale-fleshed, others mottled brown, some with dark brown stripes.

Very numerous small snails, shells from 2-3mm to ~15mm across. Found on wet pavement after early morning rain, between marsh nature reserve and urban scrubland. Some entirely white-shelled, pale-fleshed, others mottled brown, some with dark brown stripes. Are they all the same species? Are they pale due to the soil? Or something else?