(Solved): The leafy hornmouth, Ceratostoma foliatum, is a snail (found locally) with strong ribs which "fouls ...

The leafy hornmouth, Ceratostoma foliatum, is a snail (found locally) with strong ribs which "fouls the water" with a cloud of ink "fouls the water" with nasty smelling scent "fouls the air" with a strong smell "fouls the attempt" of a crab to get a grip on it