Title: Comparative zoology, structural and systematic : for use in schools and colleges
Identifier: comparativezool00orto (find matches)
Year: 1883 (1880s)
Authors: Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950
Subjects: Zoology; Anatomy, Comparative; Physiology, Comparative
Publisher: New York : Harper & Bros.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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264: COMPARATIVE ZOOLOGY. It has also close relations with the other subkingdoms of the bilaterally symmetrical animals. Through the Poly- zoa and Brachiopoda, it approaches the Mollusca; through the Annelides, the Arthropoda; and through other forms, the Tunicata, and so the Yertebrata. The subkingdom thus stands in the centre of several subkingdoms, with affinities towards all. Nor are indications of connection with Ccelenterata and Echinodermata wanting. The Vermes are bilaterally symmetrical animals,with one or many segments, no jointed legs. They usually have a soft skin, and peculiar excretory organs—the segmental organs. Many of the Worms are parasitic, and most of the En- doparasites belong to this group. There are numerous classes, of which only the most im- portant are mentioned. Class I.—Platyhelminthes.
Text Appearing After Image:
The Flat - worms include some free forms, as the Plana- ria, common in fresh water, and the Tape- worms and Flukes among the parasites. The Tape - worm consists of the so- called head—the proper worm — and the body segments, I Fig. 216 Tape-worm (Taenia solium): a, head; &, c, d, segments of the body. Fig. 217—Planarian worm.

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