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Otala lactea
Gray and brown banded snail. There was a large grouping of this and the Brown Garden Snail in this tree.
In pine tree along trail in mixed chaparral area.
Thank you for the suggestion Saarbrigger. C. hortensis and C. nemoralis haven't made it here to the west coast as far as I know. I believe Lars nailed the ID. Thank you!
Could be a "White-lipped snail" (http://en.wikipedia.org/wiki/White-lippe...) or a "grove snail" (http://en.wikipedia.org/wiki/Grove_snail...), but I do not know if they have theire happitat in California too.