A Dakshinavarti Shankh: This is the very rare sinistral form of the species, where the shell coils or whorls expand in a counterclockwise spiral if viewed from the apex of the shell.
The Dakshinavarta shankha is believed to be the abode of the wealth goddess Lakshmi - the consort of Vishnu, and hence this type of shankha is considered ideal for medicinal use.