. Agricultural zoology. Zoology. 84 ZOOLOGY. Vertebrates of brain and spinal cord, lies in Arthropods' almost entirely on the ventral side. In the head i^ situated the cerebral ganglion, a large nervous mass resting on the gullet, and giving oflf nerves to the eyes and feelers. Besides this, there is a ventral nerve-. FiG. 65.—The Large Centipede (^Scolopendra ttuyrsitans). cord on the ventral side of the animal, running below the gut, and made up of several pairs of ganglia, united with one another by means of nerve-fibres. The ganglia of the ventral cord send their nerves to the jaws, limbs,
. Agricultural zoology. Zoology. 84 ZOOLOGY. Vertebrates of brain and spinal cord, lies in Arthropods' almost entirely on the ventral side. In the head i^ situated the cerebral ganglion, a large nervous mass resting on the gullet, and giving oflf nerves to the eyes and feelers. Besides this, there is a ventral nerve-. FiG. 65.—The Large Centipede (^Scolopendra ttuyrsitans). cord on the ventral side of the animal, running below the gut, and made up of several pairs of ganglia, united with one another by means of nerve-fibres. The ganglia of the ventral cord send their nerves to the jaws, limbs, muscles, viscera, etc. The cerebral ganglion is connected with the first ventral ganglion by means of a cord on each side of the gullet (Fig. 56), so that a ring-like structure is formed. The breathing organs are gills in some Arthropods (the Crustacea, crayfish, crabs); insects and centipedes breathe by air-tubes or tracheae, while the respiratory organs of spider-like animals, when these do not breathe entirely by means of the skin, are more or less strongly modified tracheae. The structure of the tracheal system is generally as follows: on each side of the body there is a row of breathing-holes, or stigmata, through which the air can enter the trachese; these are very much branched, so that they finally become very fine tubes investing the various organs,. 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 Bos, Jan Ritzema, 1850-1928; Ainsworth Davis, J. R. (James Richard), 1861-1934. London, Chapman & Hall, Ld.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
