Testacella

Testacella, a genus of molluscs belonging to the Pulmonifera, and represented in Britain by three species. The shell, which consists of but half a whorl, is situated at the hinder end of the body. They are of subterranean habits and carnivorous, feeding chiefly upon earthworms. They usually come out in search of their prey during the night. In winter they form a cocoon-like body of cemented particles of earth, &c., which covers the upper part of the body.