. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. XV. CCELENTERATES The Ccelenterata, — The sponge, as we have seen, is an animal of simple form and of a low order in the scale of life. Another simple animal is the hydra — a type of the group Ccelenterata. The group Coelenterata includes animals which have a common food tube and body cavity. Hydra. — The common hydra lives in fresh water. It may be found living on dead leaves, submerged sticks, stones, or weeds in almost any fresh-water pond. In a small fresh-water aquarium, they almost al
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. XV. CCELENTERATES The Ccelenterata, — The sponge, as we have seen, is an animal of simple form and of a low order in the scale of life. Another simple animal is the hydra — a type of the group Ccelenterata. The group Coelenterata includes animals which have a common food tube and body cavity. Hydra. — The common hydra lives in fresh water. It may be found living on dead leaves, submerged sticks, stones, or weeds in almost any fresh-water pond. In a small fresh-water aquarium, they almost always attach themselves to the side of the jar, where they can be watched and their movements observed.^ Notice that when contracted thev re- semble a little whitish ball of jellylike sub- stance. When undis- turbed they elongate into a hollow cylinder attached at one end. A small oval opening is found at the free end, surrounded with a number of little wav- ing arms called tenta- cles. Count them to see how many there are. If by chance a small water flea or other crustacean on which the hydra feeds > See Hunter and Valentine, Manual, page 151. 195. Budding hydra, as seen under the low power of a com- pound microscope; B, attached end; B^, B^, buds; M, mouth; T, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George William, 1873-1948. New York, American book company
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