Land snail from Cuba

[paul monfils]

This appears to be a juvenile Cerion.  Initially the shell grows in an expanding spiral, like a trochid - which is what you have here - but the later whorls are all the same diameter, so the mature shell is cylindrical in shape.  This specimen has just the first few whorls.  There are many Cerion species/forms, many of which can be difficult to identify even when fully mature, so I can't venture a guess as to the species.