Hi Vanessa,
Don't you get all excited when you think someone has answered your question, but all it is is someone saying "I don't know anything about snails, but just wanted to say I hope you find the answer"? :)

Yeah, but I really appreciate you posting so this doesn't linger embarrassingly at the top of the forum! I would have had to do it myself if it went on too long!
Vanessa

I would really like to know too. Hope someone knows or has a site to look on. Several years ago someone gave me a snail id site, unfortunately that bookmark has been lost in upgrades. S

hmmm, i googled "pond snails" and found a couple good sites. they are below. not too sure from your picture, but i'm thinking it looks somewhat like an Olive Nerite Snail or an apple snail. if it grows to be the size of a baseball the later is what you have. good luck, post a better upclose picture of one, it might help everyone. here are those sites

Robyn's Snail Species Page

Aquarium Plants, Pond Plants, Freshwater Aquarium Plant & Aquarium ...

Sethwell, you could be right about it being an Apple Snail but they don't usually survive in cold ponds over winter?
That dark stripe running vertically around the shell also has me wondering if in fact it is an Apple Snail?

Maybe if we could see a clearer photograph we would know for sure?
Have a look at the information via the link below.
"Horton"

Here is a link that might be useful: Apple Snail

Ah! The pond people are on it! Thanks!
Well, I've already ruled out the apple snail because of the eggs. They're always above water and are cool little balls. I'll see if I can get a better picture after work today.
Thanks for the links, sethwell. I had Robyn's but not the other.
Vanessa

OK, if this doesn't do it, I'll just quit worrying about it. It's really just my compulsion to put a name to things, anyway.
I followed this one as it swam around the tank this morning. It's from straight over top and the bands, spottier than I realized, show nicely.

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This one is just kind of fun. It fetched up on a bit of plant and was stretching it's entire foot out to grab on and roll over.

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I've got maybe five or six big ones and lots of eggs. I'm finding them pretty entertaining. Vanessa

I have the same ones in my pond and a book i have said they should be seen as a pest, but they dont seem to be doing any harm to my plants. The eggs are a bit strange tho. I know them just as a common pond snail.

Phil, I think we have Lymnea (or Radix - they seem to be changing names). I found a helpful photo on a German website last night that I'd post if the old PC weren't so sluggish this morning. They're Eurasian and the only references in english were to them as an invasive species in the Great Lakes. There are a couple species I couldn't tell apart - ovata and auricularia. I'm glad to hear yours aren't hurting anything either. I was hoping I hadn't done a foolish thing by introducing them to my pond.
Vanessa

How about this one?? Glenda

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Thanks magdaloonie, i dont think you have made a mistake introducing them. I cant see a problem with most creatures in a pond, they are all part of the eco-system in my eyes!
Glenda i think your snail is a 'rams-horn' snail and they are the best ones for eating algae. Dont get rid of them they are great for your pond :)
Phil

I'm keeping him. I love Escargot, but after looking at that face and those big eyes and antenae, don't think I will be eating him. Thanks for the info. Glenda

I think it is a Japanese trapdoor snail. Bear live young and grow pretty big.

I bought some Japanese trapdoors, but most of them died. Found empty shells all in pond. I did find one still alive in pond when I drained it in April. This one is in the bog filter. The trapdoor that is in the pond looks like they did when I got them. This one just looks different for some reason. The trapdoors all have algae growing on them, this ones shell is so clean looking. I have a gazillion of the ones that look like ramshorn (like coils of rope). This one looks too thick to be a ramshorn. I haven't seen anything that looks like eggs of any kind though. I also have the pointy ended ones. I bet I have thousands in the bog filter. Can I have too many snails?? Glenda

I like your ramshorn Glenda. I had just one and the goldies ate it.I'm sorry your trap doors died. I was going to buy some but I haven't found them locally and the shipping is a killer (mine aren't trapdoors, Pat. I'm sure the genus is Radix, now). I'd hate to lay out 30-40 bucks to overnight a dozen snails and have them die!
I suppose you could have too many if they were eating the plants but, otherwise, I wouldn't think so. What do they hurt? I fear the goldfish ate those egg masses I had, though. My friend still has bunches and I may adopt a few more adults.

Here's the photo of the snail I found that matches mine - Lymnea (Radix) auricularia.
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Vanessa