Maybe you got this before, but I think it got lost because I
didn't get it my own self. (We've been having a bad-hair-day in
Cincinnati, 10 inches of snow on the ground and five more predicted,
and blowing and drifting, and doing all sorts of other mean things.)
    But what I wanted to ask was in regards to the discussion of
colors on shells. The question is: Do mullusks themselves perceive
color? If they don't, the idea of color being a sexual stimulant goes
out the window---into the snow. Do things that prey on Mullusks
perceive color? Can color (at depth) be perceived in any other way
than by eyesight?
     Art