I found 1 of my briggs on the floor today. Operculum (sp?) way, way inside but no stink. So I threw him back in the tank. A couple hours later & he's peeking out a very little bit so I'm hopeful...a rimless tank is not the best place to keep these guys I'm finding. He's the second or a repeat jumper. He's lucky I was cleaning under the tank today, not something I do very often. The other time we heard the snail hit the floor so it was only a matter of a few minutes but I have no idea how long this time, the shell seemed dry.