NERVOUS SYSTEM.
The nervous system has a large ganglion, J, in the thorax, from which branches, i, pass to the limbs and abdomen. At the front end two branches extend upward, each side of the œsophagus, to two smaller ganglia, k, from which pass nerves to the mandibles and eyes.
The reproductive organs, S, lie along the under side of the abdomen, and open between the two air-sacs.
The spinning-glands, u, lie above the spinnerets, and along the under side of the abdomen. They will be more fully described in the chapter on spinning.