The top is an olive snail.
One of the reasons I would strongly discourage anyone from just collecting stuff and identifying later is that this snail should be considered predatory, IMO. At least the one I had enjoyed large chunks of meaty food...
The second reason you should not do this is that you should NEVER return it to the wild.
If you keep it in a sump or FOWLR it should be fine, but you will have to feed it.
Collecting hermits is always hit or miss. Many grow in to large monsters.