I was asked for an update, so here it is...
Lettuce slug eggs at 12 days.
They have picked up some pigments along the flanks and behind the clearly developed eyes now. This is very hard to focus and photograph due to the cloudy gel casing of the egg coil. Its become cloudier and the embedded algae is starting to grow a little making them harder to see. They also seem to be able to see and react to visual stimuli.