The polyp stage of Aurelia.
These polyps are just a few millimetres long. Around the edge of this photograph, taken through a microscope, are several scyphistomae. At the centre of the photograph, is a strobila (plural = strobilae). The strobila of this species produces a chain of segments, each of which metamorphoses into an ephyra and then breaks free from the polyp.
Prepared by M. Dawson and K. Raskoff.