Melibe leonina

I am working on Melibe brain now. It is so small.

There are two small ganglia on Pleural-Pleural connective nerve. What they do?
A copepod is sitting on the brain in the dish. I think it came out from the stomach, but it is still alive. It is so pity that I have to kill it to protect my prep.

I saw a pair of green tube that seem to go to the dorsal gill from the stomach.
Is it also solar-powered?