. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. Section ot Ac- tomach, show- septa aud compartments. Class II.—Anthozoa. These marine animals, which by their gay tentacles con- vert the bed of the ocean into a flower-garden, or by tlieir secretions build np coral-islands, have a body like a round gelat- inous bag. One end, the base, is usually attached; the other has the mouth in the centre, surrounded by numerous hol- low tentacles, which are cov- ered with nettling lasso - cells. This upper edge is turned in so as to form a sac within a sac, like t
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. Section ot Ac- tomach, show- septa aud compartments. Class II.—Anthozoa. These marine animals, which by their gay tentacles con- vert the bed of the ocean into a flower-garden, or by tlieir secretions build np coral-islands, have a body like a round gelat- inous bag. One end, the base, is usually attached; the other has the mouth in the centre, surrounded by numerous hol- low tentacles, which are cov- ered with nettling lasso - cells. This upper edge is turned in so as to form a sac within a sac, like the neck of a bottle turned outside in. The inner one, which is the digestive cavity, does not reach the bot- tom, but opens into the general body-cavity. The space between these two concentric tubes is divided bj' a seriesi of vertical partitions, some of which extend from the body-wall to the digestive sac, but others fall short of it Instead, therefore, of the radiating tubes of tlie Acaleph, there are radiating spaces. Xo members of this class are microscopic. All are long - lived compared with the Ilydrozoa, liv- ing for several years. 1. Soft-bodied Pol- yps.—The best-known representative of this group is theAcfinia,or Sea-anemone. It leads a 16. Fig. exi)aiKled, seen from above, 6liowiu<r 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 Orton, James, 1830-1877. New York, Harper and brothers
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
