FAMILY TORNATINIDIE Genus TORNATINA, A. Ads.
Shell thin, inflated, cylindrical, entirely covering the animal. The spire is concealed, as in Cyprxa. The head and foot are split; the halves are reflected over the shell. The radula is replaced by a powerful gizzard in which molluscan food is ground.
So solid and compactly built do these shells seem that to Linnams they looked as if turned on a lathe, hence the name.