The aperture is ovate. The columellar(英语:Columella (gastropod)) margin is smoot. The outer lip(英语:Lip (gastropod)) has a narrow profound anal sinus on the
large. The large 殼口 is round and iridescent within. The wide columella(英语:Columella (gastropod)) is flattened and excavated, deflexed recurved and somewhat
lamellae. The clausilium of Clausilia dubia, as it articulates with the columella of the shell (upper right). Clausilium of Cochlodina laminata. Clausilium