. Elementary anatomy and physiology : for colleges, academies, and other schools . Digestive Apparatus of Unicellular Animals. 356. The Hydra.—Fig. 199, an unicellular animal, is an example where the simplest sort of digestive organs is ex- hibited. The animal is little ^. ^ else than a gelatinous sac, and if it be turned inside out digestion will still go on. Thus, " notwithstanding the simplicity of its structure, this creature feeds not merely upon algae, but upon young • active animalcules, the young of crustaceans, etc. ; any one of these, when they happen to came in contact with one
. Elementary anatomy and physiology : for colleges, academies, and other schools . Digestive Apparatus of Unicellular Animals. 356. The Hydra.—Fig. 199, an unicellular animal, is an example where the simplest sort of digestive organs is ex- hibited. The animal is little ^. ^ else than a gelatinous sac, and if it be turned inside out digestion will still go on. Thus, " notwithstanding the simplicity of its structure, this creature feeds not merely upon algae, but upon young • active animalcules, the young of crustaceans, etc. ; any one of these, when they happen to came in contact with one of the tentacular filaments, be- usually retained by As this itself, all the surviving filaments ap- ply themselves to this captive particle, so that it becomes gradually inclosed, and grad' mg adkesion to it. filament shortens Hydra or Fresh Water Polyp, trance and Exit to Stomach. a. En' 356. What is the process of digestion in the hydra ?
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