Those are dog tape worm eggs, they should be on the intestines as well. Not unusual to kill a rabbit that has them. They call them beads here in PA and the oldtimers would always say don't kill a rabbit until after a killing frost so they won't have beads. Not true but a good rural ledgend. Doesn't ruin the meat for eating but make sure your dog doesn't eat the entrails. If there are spots on the liver that look like cottage cheese, put the rabbit down a hole, do not touch the insides, it is tularemia (rabbit fever) and you can get it through cuts and scrapes on your hands. I also am curious what state has rabbit season open in June?