|Polygyra (Daedochilus) dorfeuilliana (8mm) and Rabdotus dealbatus (4mm)|
I sent these to Dr. Christ Barnhart and got the species identified from left to right as Polygyra (Daedochilus) dorfeuilliana and Rabdotus dealbatus. These are both air-breathing land snails, meaning that they evolved from their oceanic ancestors, losing their ancestral gills and developing a "lung" inside their mantle. Most land snails are herbivorous, eating leaves and stems of plants as well as fungi and algae.
Turning more rocks we found a small scorpion. It measured 10mm (2/5 inch) and tried to look dangerous by raising up its "tail." They have large pedipalps out in front with pincers for grasping their food like their crayfish cousins. For some strange reason, we always seem to focus on the rather small terminal segment of the tail, possibly because of its stinger. With the exception of several southwest desert species, the sting in mildly painful, described as "... an immediate intense, localized, burning sensation with little redness or swelling; symptoms usually subside after about 30 minutes." I guess that "mild" is in the finger of the beholder.
More on scorpions is on this IPM Fact Sheet.