Flinders Island cave-slater Echinodillo cavaticus. The world has only two known species of the very distinctive Echinodillo cave-slaters. One is found on the Marquesas Islands in the middle of the Pacific Ocean. This other species is known only from a small cave in southern Flinders Island, where its entire global range is measurable in square metres. We found this one during our Bush Blitz on Flinders Island in March 2014.
Location: either Belle Ile or near Trinite-sur-Mer
Bittium reticulatum, B. simplex?
http://nature22.com/estran22/mollusques/gasteropodes/gasteropodes21.html