Shell turbinate, globular or depressed, height at least slightly more and usually much more, than half diameter (or if less than half diameter, as in Helicella itala, then shell opaque chalky white, usually banded), frequently with either patterned colouring or periostracal hairs, peristome frequently thickened and reflected in adult and periphery sometimes angular ;usually more than 10 mm. diameter (helicidae)