. A textbook in general zoology. Zoology. 62 HYDR^, JELLYFISHES, SEA ANEMONES, CORAL POLYPS eye. Because of the alternate lateral branching of the vertical stems, the animal shows a striking resemblance to a plant. Usually, near the base of the vertical stem bearing the zooids will be found one or more club-shaped cavities, formed at the ends of short lateral branches. These cap- sules are closed at the free ends and contain within them the reproductive zooids (Fig. 18, rp). While within the trans- parent capsule the reproductive zooids are mere buds and are called medusa buds. After a time th
. A textbook in general zoology. Zoology. 62 HYDR^, JELLYFISHES, SEA ANEMONES, CORAL POLYPS eye. Because of the alternate lateral branching of the vertical stems, the animal shows a striking resemblance to a plant. Usually, near the base of the vertical stem bearing the zooids will be found one or more club-shaped cavities, formed at the ends of short lateral branches. These cap- sules are closed at the free ends and contain within them the reproductive zooids (Fig. 18, rp). While within the trans- parent capsule the reproductive zooids are mere buds and are called medusa buds. After a time the capsules break open and the medusa buds pass out, one by one, and are then known as medusas, and sometimes jellyfish. They are umbrella-shaped and are found floating with the convex side uppermost. After a time these medusae produce eggs that finally develop into the plantlike, colonial organism with which we started. Jellyfishes Olass II. — Scyphozoa {cuplike animals) Nearly all of the large jellyfishes belong to this class and, in general, it may be said that the members of this class are larger than those of the Hydrozoa. Moreover, the majority of the Scyphozoa swim freely on the surface of the ocean. A few are found to inhabit the ocean FiQ. 19.—Jellyfish (4urcZia). at great depths. The common jellyfish, Aurelia. — This is a true jellyfish and has a convex, tough, jellylike body and is often found. 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 Herrick, Glenn W. (Glenn Washington), 1870-1965. New York, Cincinnati [etc. ] American Book Company
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