. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. 62 COMPARATIVE PHYSIOLOGY OF THE BRAIN are stretched out at once and are moved hither and thither as if feeling for something-, and soon the tips of one or more arms turn over and touch the un- derlying surface with their ventral side (Fig. 17). The tube-feet of these arms attach themselves to this. FIG. 17. MECHANISM OF THE TURNING OF A STARFISH THAT HAS BEEN LAID ON ITS BACK. The tube-feet of the three arms at the left are pulling while the other two arms are quiet. This causes the animal to tur
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. 62 COMPARATIVE PHYSIOLOGY OF THE BRAIN are stretched out at once and are moved hither and thither as if feeling for something-, and soon the tips of one or more arms turn over and touch the un- derlying surface with their ventral side (Fig. 17). The tube-feet of these arms attach themselves to this. FIG. 17. MECHANISM OF THE TURNING OF A STARFISH THAT HAS BEEN LAID ON ITS BACK. The tube-feet of the three arms at the left are pulling while the other two arms are quiet. This causes the animal to turn a somersault toward the left which brings it again into the natural position. surface, and the animal is then able to turn a somer- sault and regain its normal position. For this result, it is essential that all five arms do not attempt simultaneously to bring the animal into the ventral position. Should the tips of all five, or even four, arms tug simultaneously, it would be impossible for the animal to turn over. In normal starfish having five arms, not more than three begin the act of turn- ing; the other two remain quiet. If we, however,. 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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