What is the thick or thin jellylike layer between the cell layers of cnidarians?

The jellylike layer between the cell layers of cnidarians is called mesoglea. It is a gelatinous substance that provides structural support and helps with buoyancy in organisms like jellyfish and sea anemones. Mesoglea is not a true tissue but serves as a medium for the transport of nutrients and waste between the outer epidermis and inner gastrodermis.