. Animal biology. Biology; Zoology; Physiology. THE INVERTEBRATE BODY 101 cavity, or coelom, in which are disposed many of the chief organs. Accordingly the Coelenterates, with an enteron but no coelom, are referred to as Acoelomates, and the animals above the Coelen- terates, since they possess the coelom, are known as the Coelo- mates. The difference in structure can best be made clear by comparing the body plan of a higher Invertebrate, such as the common Earthworm, with that of Hydra. (Fig. 313.) 1. Body Plan Whereas the Hydra body is essentially a sac composed of two layers of cells surro
. Animal biology. Biology; Zoology; Physiology. THE INVERTEBRATE BODY 101 cavity, or coelom, in which are disposed many of the chief organs. Accordingly the Coelenterates, with an enteron but no coelom, are referred to as Acoelomates, and the animals above the Coelen- terates, since they possess the coelom, are known as the Coelo- mates. The difference in structure can best be made clear by comparing the body plan of a higher Invertebrate, such as the common Earthworm, with that of Hydra. (Fig. 313.) 1. Body Plan Whereas the Hydra body is essentially a sac composed of two layers of cells surrounding the enteric cavity, the body of the Earthworm is built on the plan of a tube within a tube — the Mouth. Anus. 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 Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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