These are the true as found in environments.
Most scyphozoans, members of phylum Cnidaria, display both polyp and medusa stages in the course of their life cycles. The polyp stage is the longer lived, animal while the medussas are free living, , and animals.
Note that jellyfish usually lack a polyp stage.
The of jellyfish, that is, the non- part, is what is shaped like a drinking bowl, particularly an upside-down drinking bowl (which in turn is basically a variation on a ).
See also anthozoan, , and scythozoan.