Jellyfish canal. Cilia in these canals circulate the fluid in a regular direction. The box jellyfish is largely similar in structure. It has a squarish, box-like bell from each of the four lower corners of which hang a short pedalium or stalk which bears one or more long, slender tentacles. The rim of the bell is folded inwards to form a shelf known as a velarium which restricts the bell's aperture and creates a powerful jet when the bell pulsates, allowing box jellyfish to swim faster than true jellyfish. Hydrozoans are also similar, usually with just four tentacles at the edge
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