Nora,
Emilio's response is right on the money, except the spelling of Pomacea
canaliculata.

As testimony to the fortitude of snails (although I'm not saying not put
your snails in the pool, just keep a watchful eye), on several occasions
I've frozen leaf litter samples, etc. to save until later when I had more
time.  On virtually every occasion, as I'm sorting through the litter, or
whatever, I notice the little snail's hearts beating, after thawing....

Although Pomacea is generally a Tropical group, they may still be hardy
enough to make it through even a Calgary winter....who knows?

Kurt

At 03:41 PM 6/16/99 EDT, you wrote:
>Ampullaria is not a valid Genus name according to Fred Thompson in his book,
>Freshwater Snails of Florida. The apple snails commonly sold in stores are
>usually the South American Pomacea bridgesi and P. caniculata and not both
>are now found in the wild in parts of South Florida. I would not suggest
>putting any non-native species into these ponds (this is the way the P.
>bridgesi and P. caniculata got into the waters of south florida). In addition
>I'm not sure they would make it due to the cold since these are tropical
>snails.
>