The first picture is with polarized light and the second picture is without polarized light.
You see a living Copepode (maybe somebody can say as the family?) from the sea, on the Copepode are epibionts (sessile cilates). I dont know the function (the substance) of the dark parts of the animal.
The polarized light has a nice effect for the picture of the eyes. You can see them better in poalized light. Is this the rhodopsin which is reacting in this way?
Brightfield, objective 4x, cropped.