. Elementary text-book of zoology. Zoology. 60 ORGANIZATION AND DEVELOPMENT OF ANIMALS IN GENERAL. (gastro-vascular system of Polyps, so-called vessels of Medusae and Ctenophora). The so-called stomach of the Anthozoa is simply an invagination of the body wall into the central cavity of the animal, and functions only as oesophagus. When a distinct alimentary canal is present, the chyle is absorbed by the walls of the gut, and passed through them into the coelom or space developed between the gut and body walls (into the general D. Br FIG. 51.—Daphiiia with simple heart. C, the slit-like openin
. Elementary text-book of zoology. Zoology. 60 ORGANIZATION AND DEVELOPMENT OF ANIMALS IN GENERAL. (gastro-vascular system of Polyps, so-called vessels of Medusae and Ctenophora). The so-called stomach of the Anthozoa is simply an invagination of the body wall into the central cavity of the animal, and functions only as oesophagus. When a distinct alimentary canal is present, the chyle is absorbed by the walls of the gut, and passed through them into the coelom or space developed between the gut and body walls (into the general D. Br FIG. 51.—Daphiiia with simple heart. C, the slit-like opening on one side is seen; D, alimentary canal; L, liver; A, anus- G, brain; O, eye; Sd, shell gland; Br, brood pouch placed dorsally beneath the carapace. tissue of the body in the acoelomate parenchymatous worms), and there gives rise to a fluid, the blood, in which (with some few exceptions) corpuscles (cellular structures produced in the organism) are found. In this space, or in a system of lacuna? derived from it, the blood circulates. Primitively its movements are quite irregular, taking place with each movement of the body (as in many worms), and are effected chiefly by the contractions of the somatic muscles. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
