The smaller of the two live Helminthoglypta found together in this location. Park website for nearby Elfin Forest lists Helminthoglypta walkeriana, Helminthoglypta umbilicata and Helminthoglypta fieldi. These live snails had thinner, less-sturdy shells than the dead ones of the same size (they were possibly Helminthoglypta umbilicata, but I'm no expert!).