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[wolfi]

Hi JeffD,
we talked about #2 elsewhere....... ;-)
#3: Neritidae, without doubt, but I don't think it's Neritina virginea, because N. virginea has very small teeth and in your specimen the teeth are too large. Should be a juvenile specimen of a larger species. Sorry to say, but for a valid determination we need more and better pictures taken at different angles.
Kind regards: wolf