This is the kind of yellow C. Hortensis I see on my walks sometimes after rain. I have actually looked for them and they are quite hard to find. I only usually come across them in ideal rainy conditions.
Their usually found in the snail sites I know of near the mersey estuary that flows past the end of my street. I have never seen any of this kind in any wooded or urban area.
I only keep a couple because there doesn't seem to be much variety in the area they come from. They are the only ones i have spotted that have no banding. They happily eat lettuce, cauliflower leaves, etc and anything a GALS eats. They eat straight downwards into chunks of cuttlefish and make little boreholes. I haven't witnesses any other snail do that!
If you are looking to breed a certain variety, I have had eggs from one of these so they will breed in a tank. I could find you one or two if we had some rain and you were willing to pay the postage.
Your welcome to some of their hatchlings if you want to pay the postage? I have eggs at the moment from them but I am unsure that it was actually these two that produced them. If any are baby unbanded yellow or rose I will put pics up as soon as they are big enough.