Renter: Snail shells (e.g. Helix) with 2 cells. The closed shell is buried into the ground and the place where the shell was buried is covered with dried vegetable matter.
Nesting material: The partitions between the cells are made of chewed leaves (e.g. from Crataegus). The outermost cell is closed by a long nest plug consisting of four compartments each limited by walls made of leaf pulp: the first compartment is empty, the second is filled with sandy earth and the third and fourth are filled with pebbles and earth crumbs. The shell surface is plastered with patches of leaf pulp. (Grozdanic, 1971)