Box jellyfish box jellyfish's nervous system is more developed than that of many other jellyfish. They possess a nerve ring around the base of the bell that coordinates their pulsing movements, a feature found elsewhere only in the crown jellyfish. Whereas some other jellyfish have simple pigment-cup ocelli, box jellyfish are unique in the possession of true eyes, complete with retinas, corneas and lenses. Their eyes are set in clusters called rhopalia, located in pockets halfway up the outer, flat surfaces of the bell. Each contains two rhopalial ocelli with lenses, one directed upwards and the other downwards and inwards towards the
Jellyfish Lake unusual damage in the 1998 time frame; however, the population seemed no smaller than usual. Tourists are required to obtain a pass to access Jellyfish Lake. The Rock Islands/Jellyfish Lake pass is $100 and is good for 10 days. Snorkeling in Jellyfish Lake is a popular activity for tourists to Palau. Several tour operators in Koror offer trips to the lake. Eil Malk island is approximately a 45-minute boat ride from Koror. The lake is accessed by a short trail from the beach on Eil Malk to the lake. Scuba diving by tourists in the lake is not allowed. Two