What is a half-developed eye? Your skin is a half-developed eye in that it can sense light but does not resolve an image. Some single-celled critters can detect light, and simple invertebrates such as brine shrimp have eye spots that also just detect light. Farther up the scale are the arthropod eyes that can detect shades of light and movement. Then you've got eyes that can resolve only black and white, or some colors. But then again, you've got insect eyes which can resolve colors well into the ultraviolet end of the spectrum. What do you consider a half-developed eye?
As for half-developed nervous systems, what would you consider that to be? Would it be the stimulus-response receptors found on jelly-fish, the non-centralized nervous system of the starfish, the ganglia-controlled stimulus-response system of insects? You need to be a little clearer.
Or the fledgling chordate nervous system of Amphioxus?
Thank you for an intelligent response. All of the examples that you cite exist in fully functioning, integrated creatures. What I'm looking for is a skunk with gills. Or a mouse with a half-formed wing. Or an Octupus with legs. Fossilized mutational "duds."
For example, some people point to the archaeopteryx as a transitional form, which is certainly a logical possibility. But the reason that I don't find it particularly compelling as evidence of evolution is that it seems to have been a creature that was capable of functioning well "as-is." And, in fact, a bunch of archaeopteryx fossils have been found, seemingly demonstrating that it came into being fully formed and functioning and left the same way, just like most other creatures, if we are to judge by the evidence in the fossil record.
(Or take the platypus. Is it a transitional "dud?" Is it the "missing link" between muskrats and ducks? Or is it a fully-formed, integrated, functional creature?)
At least that's what we should expect from "punk eek." If evolution happened by micro-mutation, then the fossil record for evolution should be even more compelling, absolutely filled with "transitional forms." But the evidence is quite the opposite.