Digestion in Hydra therefore can be divided into two phases, the preliminary digestion outside the cells of the endodermis (extracellular), and the secondary phase inside the cells (intracellular). The main digestion is extracellular. The cells of the gut merely absorb the digested remains. In all cnidarians (corals, hydroids, jellyfish, sea anemones, etc) digestion is partly extracellular and partly intracellular.