The True Jellyfish (Scyphozoan) has a medusa body plan. It has a round bell, tentacles attached at the margin or edge of the bell, and oral arms attached further in surrounding the mouth. It's gonads are the ring shaped structures in my model. It also has rhopalia, which are sense organs that can detect light and dark, and up versus down.
The Box Jellyfish, or Cubozoan, has a somewhat different anatomy. Its bell is square when viewed from top or bottom. Its tentacles are attached to the corners of the square by structures called pedalia. There can be one tentacle, or many, attached to each pedalium. Cubozoans also have sense organs called rhopalia, but theirs are more advanced than those of scyphozoans. They have some rhopalia which actually look like an eye, though others are more simple. In addition to light and dark and up/down, they can distinguish colors, although they do not seem to see white well. They avoid things that are red.
Here is a video of me explaining the models:
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