The shell of this species is variable in degree of
sculpture, depending on how exposed or sheltered the environment is in which the snail lives. These different forms are called
ecomorphs. The shells can reach 73 mm in size. The interior of the shells are lined with
mother of pearl, whereas the exterior of the shells are often decorated with stumpy outgrowths that resemble hands or fingers. The spire of the shell is flattened, and the
whorls may be distinctly angular in outline when viewed from above. There is a deep
umbilicus, and when alive, the snail exhibits a brown horny
operculum. == Distribution ==