The land snail Paramastus spratti, endemic to south-central Turkey, is in the family Enidae. Unlike some other endemic enids, however, this one is somewhat rare and is known only from a few spots.
Adult shells are about 20 mm in height. In the lot of 138 shells that I was measuring the other week, there were only 2-and this was one of them-that still had their yellowish brown periostracum. Most empty shells one is likely to encounter are chalk-white like the one pictured below.
This picture shows the columella of P. spratti in the shell's body whorl. Some enid species, especially those that develop a lamella on their columella that is visible in the aperture, have a twist in their columella within the body whorl. Paramastus spratti, which lacks any prominent lamellae or "teeth" in its aperture, has a straight columella.
Some of the previous entries in the land snails of Turkey series: