I remember the two from the Moldvay Basic Set (tarantella and thoul), and had never encounter the Arduin two until this thread. I don't remember a red slime in and D&D I have read, but do remember one from The Fantasy Trip. The were a monster from In The Labrynth (that system's DMG), and also appeared in Death Test II. TFT had one type of slime that was immune to fire and blows, but you could tear it apart with your hands, but I don't remember if that was the brown or the red. Now I'll have to pull out my In The Labrynth when I get home. (I'm at work now.) Curse you, Jester.