Aurelia aurita = Aurelia sp.
English: Reproductive anatomy of an undetermined moon jellyfish species:
1: Oral arm with brood pouches
6: Transverse section of arm with many brood pouches
c / d [right] / e / f: brood pouches, d [left] = digitella, ect = ectoderm, end = endoderm, G = arm groove, m = mouth, mes = mesogloea.
Date 1889 (published 1890)
Source Proceedings of the Zoological Society of London (vol. 1889 issue 4, plate LVIII)
Author E.A.Minchin
Source: https://commons.wikimedia.org/wiki/File:PZSL1889Plate58.png

The common jellyfish, moon jellyfish, moon jelly, or saucer jelly (Aurelia aurita) is a widely studied species of the genus Aurelia. The moon jellyfish is translucent and can be recognized by its four horseshoe-shaped gonads, easily seen through the top of the bell. Aurelia aurita is found along the eastern Atlantic coast of Northern Europe and the western Atlantic coast of North America.