Helicodonta obvoluta(Müller,1774)
Shell is thick,disc-shaped and dark reddish brown,the lip whitish,young shells are covered in hairs,
11-15 mm wide x 5-7 high mm.There are 5-6 whorls,the aperture is oblique and trilobate.The umbilicus is wide and deep.
Animal dark-grey.
In warm sheltered woods in hills,likes a chalky soil.
Widely spread in Europe.
photo:Helmut Nisters