Given they are the same color as the krausen ring I'd say its yeast that didn't drop to the bottom. But I like the term yeast raft.
Give it a taste and you'll know pretty well whether it's caused by something bad.
Edit: to get rid of them you could sanitize a spoon or ladle or something of the sort and scoop them out. Or if you're bottling I would just rack into the bottling bucket and try not to suck a lot of it up as you did.
Perfectly normal, and totally harmless. Don't go sticking spoons and stuff in there - just leave it alone and they'll either sink in due course, or, if they're still floating when it's time to rack to the bottling bucket, they'll get left behind.