ABSTRACT
The sea urchin lantern coelom encloses the lantern of Aristotle and is separated from the general body coelom. Different bags and pouches make the lantern coelom a much more sophisticated organ than assumed by former authors. Coelomic epithelia consist of flagellated cells, nerve axons and epithelial muscle cells. Beating of the flagella as well as movement of the lantern create fluid currents assuming that the lantern coelom serves as a circulatory system. Some coelomic spaces are totally separated from the lantern coelom indicating that they have special functions. Stewart Organs, which are found in some echinoid groups, seem to serve for waste removal.
