. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. CHAPTER V EXPERIMENTS ON ECHINODERMS i. The nervous system of the starfish consists, first, of a central nerve-ring around the mouth (Fig. 16), and, second, of the peripheral nerves radiating from this ring into each of the arms. It is a well-known fact that if such an ani- mal be laid on its back it soon rights itself. In species like that repre- sented in Fig. 16 the ambulacral feet found on the ventral surface in great numbers ex- ecute the righting. These little feet are muscular tubes, which
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. CHAPTER V EXPERIMENTS ON ECHINODERMS i. The nervous system of the starfish consists, first, of a central nerve-ring around the mouth (Fig. 16), and, second, of the peripheral nerves radiating from this ring into each of the arms. It is a well-known fact that if such an ani- mal be laid on its back it soon rights itself. In species like that repre- sented in Fig. 16 the ambulacral feet found on the ventral surface in great numbers ex- ecute the righting. These little feet are muscular tubes, which end in a plate. By means of this plate the foot, like the sucker of the leech, can cling to solid bodies. If a starfish be laid on its back, the tube-feet of all the arms 61. FIG. 16. NERVOUS SYSTEM OF A STARFISH. a, central nerve-ring that surrounds the mouth, />, peripheral nerves of the 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 Loeb, Jacques, 1859-1924. New York, G. P. Putman's Sons; [etc. , etc. ]
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