The puzzle pictures this time show the structure of the lens of the
eye. This is a specialised part of the cuticle of the animal - transparent
so that light can pass through and thickened into a convex structure with
refractive properties to focus light on to the retina of the eye.
Within the structure of this cuticular lens you can see the microfibrils
which give it its special properties. At the outer edge is a homogeneous
layer, the epicuticle.
The inner edge lies on the lentigen cells which are responsible for
the production of the lens. The masses of granular material in these cells are involved in the secretory process which produces the cuticle.
You can see more details of the microfibrils and of the lentigen cells
in the Opiliones Notes.