. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 270 COMPARATIVE ZOOLOGY. Crab, we see an increasing consolidation of the exoskele- ton, and more perfect limbs, and a tendency to concen- trate the body in front, and thin out behind. Along with these progressive steps, we notice the muscular powers be- coming more energetic, and the nervous ganglia condens- ing into larger masses. The subkingdom is divided into five classes: the aqnat- ic Worms and Crustaceans, and the air-breathing Spiders, Myriapods, and Insects.'" The various forms of articulat
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 270 COMPARATIVE ZOOLOGY. Crab, we see an increasing consolidation of the exoskele- ton, and more perfect limbs, and a tendency to concen- trate the body in front, and thin out behind. Along with these progressive steps, we notice the muscular powers be- coming more energetic, and the nervous ganglia condens- ing into larger masses. The subkingdom is divided into five classes: the aqnat- ic Worms and Crustaceans, and the air-breathing Spiders, Myriapods, and Insects.'" The various forms of articulate life arise from the nnequal development of the body-seg- ments and variation in the number and form of append- ages. Class I.—Annelida. The Annelids, or Worms, are distinguished from all other Articulates by the absence of hollow articnlated. Fia. 241.—Marine Wuiiu (CiiTatuliis r/randis), with esteuded cirri. 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
