. A manual of zoology. Zoology. 54 ARTHROrODA ladder-like nervous system consists, as was pointed out (p. 113), of a dorsal brain i^supraresophageal ganglia) and a ventral chain of ganglia, all connected bv longitudinal ner\'e cords, the brain being connected witli the rest by cords or commissures passing on either side ol the a-sophagus. The ventral chain shouki coniaiir as many pairs of ganglia as there are somites, but tliis is not the case except in the embryo. The tendency is rather towards a fusion of ganglia, especial))- of those somites wlrich unite or fuse. This fusion of ganglia occu
. A manual of zoology. Zoology. 54 ARTHROrODA ladder-like nervous system consists, as was pointed out (p. 113), of a dorsal brain i^supraresophageal ganglia) and a ventral chain of ganglia, all connected bv longitudinal ner\'e cords, the brain being connected witli the rest by cords or commissures passing on either side ol the a-sophagus. The ventral chain shouki coniaiir as many pairs of ganglia as there are somites, but tliis is not the case except in the embryo. The tendency is rather towards a fusion of ganglia, especial))- of those somites wlrich unite or fuse. This fusion of ganglia occurs to a -wir^ing extent in dilTerent species, tlie extreme being reached in the spiders and crabs (fig. 402) .-1 D. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
