This a Whelk?

[BC Mosaic]

Yes he is rather cool looking. A hitchhiker. I'd like to keep him and at the moment have him caged up in those plastic trap boxes with the piano keys for one way entry only - no exit - yet he is strong enough and determined enough that he managed to pry those keys apart. Almost got away!
I've read that these guys are predators especially against Astrea sp, turbos included. I'm down to 1 Stoamta (sp?) snail whereas I had quite a few and they were multiplying.