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View of the left half of cistella (Argiope) neapolitiana, which has been cut in two by a median longitudinal incision, to show the disposition of the organs. Partly diagrammatic. The inorganic part of the shell only is shown. The tubular extensions of the mantle ad the organic outer layer are not indicated, and hence the pores appear open.
1. The ventral valve.
2. The dorsal valve.
e. The stalk.
4. The mouth.
5. Lip which overhangs the mouth and runs all round the tentacular arms.
6. Tentacles.
7. Ovary in dorsal valve.
8. Liver diverticula.
9. Occlusor muscle; its double origin is snown.
10. Internal opening of left nephridium.
11. External opening of left nephridium.
12. Ventral adjustor. The line from 10 crosses the dorsal adjustor.
13. Divaricator muscle.

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