. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. Ai.RVOUb SYSTEM AND GENERAL j^ENSATlON. 17. 65. In the Radiata, (Fig, 12,) the nervous system is re-duced to a shigie ring, encirclingthe mouth, and giving off threadstowards the circumference. It dif-fers essentially from that of theMollusks, by being disposed in ahorizontal position, and by its star-like form. 66. The nerves branch off anddiffuse sens
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. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. Ai.RVOUb SYSTEM AND GENERAL j^ENSATlON. 17. 65. In the Radiata, (Fig, 12, ) the nervous system is re-duced to a shigie ring, encirclingthe mouth, and giving off threadstowards the circumference. It dif-fers essentially from that of theMollusks, by being disposed in ahorizontal position, and by its star-like form. 66. The nerves branch off anddiffuse sensibility to every portionof the body, and thereby men and ^^Lthe higher animals are enabled to gain a knowledge of thegeneral properties of the objects which surround them ; everypoint of the body being made capable of determining whetheran object is hot or cold, dry or moist, hard or soft, &c. Thereare some parts, however, the ends of the fingers, for exam-ple, in which this sensibility is especially acute, and thesealso receive a larger supply of nerves. 67. On the contrary, those parts which are destitute cfsensibility, such as the feathers of birds, the wool of ani-mals, or the hair of man, are likewise destitute of nerves.But the conclusive proof that sensibility resides