O.K., so, what does a fluke look like? I've tried to figure it out from pictures on the internet, but it seems like they're all microscopic. Can you see the little buggers?

Also, I've seen a gelatinous critter in the toilet - 3 or 4 inches long, tapering to the tail end, with about an inch of solid, red, dotted, dry , grainy contents in about the middle. Anyone know what this might be?