Various lymnaeids carry liver flukes which have infected humans....I guess
through open wounds.  Fossaria is a genus that comes to mind, at least here
in Florida.  The life cycle unsually runs through grazing animals.
Fossaria is often amphibious, occuring in wetter places in pastureland....
And there are some websites on this although I have none listed in my
"Favorites" section...If interested, do a search on liver flukes....

Kurt

At 11:51 AM 9/12/00 -0400, you wrote:
>        I don't know of any human parasites that are carried by land snails,
>nor can I imagine what the mode of transmission from snail to human might
>be, unless you ate them raw.