Unlike normal jellyfish, the box jellyfish have 24 eyes (similar to our own) that help them avoid bumping into obstacles as they swim around the ocean.
The eyes of box jellyfish are located on cup-like structures that hang from their cube-shaped bodies.
Whereas we have one set of multi-purpose eyes that sense color, size, shape and light intensity, box jellyfish have four different types of special-purpose eyes. The most primitive set detects only light levels, but one set of eyes is more sophisticated and can detect the color and size of objects.
One of these eyes is located on the top of the cup-like structure, the other on the bottom, which provides the jellyfish with “an extreme fish-eye view, so it’s watching almost the entire underwater world,” said Garm, who will present his research at the Society of Experimental Biology’s annual meeting, in Scotland.
http://www.livescience.com/animalworld/070330_jellyfish_eyes.html - via Scribal Terror