I'm trying to understand what the organs in the Botan Ebi head are. First picture is of two organs that are attached to the meat stuck on the carapace. Pulling this part out leaves a black elliptical sac right behind the eyes (second picture). The two organs in the first picture can be separated from the meat resulting in a large grey/grey-orange/brown tinged sac, and pair of much smaller bright orange sacs. Can anyone help me identify these? I've looked at many diagrams and schematics but in the end I'm not confident in identifying them myself. Help appreciated!