Mesoglea, also known as mesohyl, is the translucent, non-living, jelly-like substance found between the two epithelial cell layers in the bodies ofcnidarians and sponges. Mesoglea refers more correctly to the tissue found in jellyfish and it functions as a hydro-static skeleton. Mesohyl generally refers to tissue found in sponges. . The mesoglea serves as an internal skeleton, supporting the body. Its elastic properties help restore the shape after it is deformed by the contraction of muscles.