Totoralia is a genus of limpet-like helcionellid known from Cambrian deposits including the Burgess Shale. It comprises two species. T. reticulata bears a net-like pattern spread over a series of concentric ridges. ... Found on http://en.wikipedia.org/wiki/Totoralia
1) Burgess Shale fossil 
Totoralia is a genus of limpet-like helcionellid known from Cambrian deposits including the Burgess Shale. It comprises two species. T. reticulata bears a net-like pattern spread over a series of concentric ridges. ...