. Text-book of zoology for schools and colleges. Zoology. SCOLEOIDA. 109 4. Acanthocephala (Thorn-headed worms). 5. Gordiacea (Hair-worms). 6. Nematoda (Round-worms and Thread-worms). 7. Hotifera (Wheel-animalcules). Oedek I. T^NiADA (Gr. tainia, a ribbon).—In this order are comprised the ribbon-shaped Tape-worms (Fig. 39, 5) and. Fig. 39.—^Morphology of Tseniada. 1. Ovum containing the embryo in its leathery case; 2. A bladder-worm {OyaUcercus longicollds), magnified; 8. Head of the adult T(Enia eoUum, enlarged, showing the suckers and crown of hoolclets; 4. A single generative joint, enlarge
. Text-book of zoology for schools and colleges. Zoology. SCOLEOIDA. 109 4. Acanthocephala (Thorn-headed worms). 5. Gordiacea (Hair-worms). 6. Nematoda (Round-worms and Thread-worms). 7. Hotifera (Wheel-animalcules). Oedek I. T^NiADA (Gr. tainia, a ribbon).—In this order are comprised the ribbon-shaped Tape-worms (Fig. 39, 5) and. Fig. 39.—^Morphology of Tseniada. 1. Ovum containing the embryo in its leathery case; 2. A bladder-worm {OyaUcercus longicollds), magnified; 8. Head of the adult T(Enia eoUum, enlarged, showing the suckers and crown of hoolclets; 4. A single generative joint, enlarged to show the branched ovary (p), the generative pore (a), and the water- vascular canals (&); 5. Fragment of Taenia Bolium, showing the generative joints and the alternate arrangement of the generative pores. the bladder-worms or cystic worms (Fig. 39, 2). These were formerly described as distinct groups; but it is now known that the latter are merely the young forms of the former. The peculiarity which distinguishes the development of the Tceni- ada, and which led to the cystic worms being described as distinct animals, is that the different stages of growth are always found inhabiting different animals or " ; If the fully-grown tape-worm is found in one animal, then its young form or cystic worm will always be found in another. Many animals are infested by tape-worms; but all the leading points of interest in the order will be brought out by a consideration of the commonest of the three tape-worms to which man is subject—^namely, the common tape-worm, or Tcenia 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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