. Animal physiology. Physiology, Comparative; Physiology, Comparative. ENTOZOA. ROTIFERA. 97 tain the same general plan of structure ; but in which there is a yet greater simplicity of conformation. This is the case in the group of Entozoa, or Intestinal Worms, of which nearly all reside exclusively in the bodies of other animals. They possess, for the most part, the worm-like form; but their various parts cannot be so definitely distinguished. We first lose a distinct apparatus for the circulation of the blood; the nutritious fluid, where it has any proper movement, appearing to flow through
. Animal physiology. Physiology, Comparative; Physiology, Comparative. ENTOZOA. ROTIFERA. 97 tain the same general plan of structure ; but in which there is a yet greater simplicity of conformation. This is the case in the group of Entozoa, or Intestinal Worms, of which nearly all reside exclusively in the bodies of other animals. They possess, for the most part, the worm-like form; but their various parts cannot be so definitely distinguished. We first lose a distinct apparatus for the circulation of the blood; the nutritious fluid, where it has any proper movement, appearing to flow through channels excavated in the soft tissues. At the same time the nervous system becomes less and less distinct; and at last even the intestinal canal seems like a mere channel, hollowed out. Fig. 59—Tape-worm. through the soft and almost jelly-like body. We observe, too, a still greater repetition of the same parts through the different segments; and a less dependence upon each other and upon the head. Thus the Taenia, or Tape-worm, may lose a large propor- tion of its joints, without appearing to suffer in consequence. In some of these parasitic animals, the worm-like form seems almost or completely lost; and there is some indication of the radiated type. 117. Another group that seems to belong to the lower por- tion of the Articulated series, is one of great interest to the microscopical inquirer; containing a variety of very curious animals, of such minuteness, that they can be only just discerned by the naked eye under the most favourable circumstances; and at the same time of such transparency, that their structure can be as completely made out, by the assistance of the microscope,. 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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