Animal life in the sea and on the land . 1SG ANIMAL LIFE IN THE SEA AND ON THE LAND. in the air. Last of all are the mammals, whose superiorendowments crown the 3. The Spinal Column.—The most important peculiarityof this family is that the greater part of its memberspossess a backbone, or, more properly speaking, a spinal BACKBONED ANIMALS. 18 column, which is composed of a chain of small bones orvertebrae. Owing to this fact, the name Vertebrata hasbeen given to the sub-kingdom. The vertebrae are unitedside fiy side by means of ligaments, and as each vertebrahas an opening through its
Animal life in the sea and on the land . 1SG ANIMAL LIFE IN THE SEA AND ON THE LAND. in the air. Last of all are the mammals, whose superiorendowments crown the 3. The Spinal Column.—The most important peculiarityof this family is that the greater part of its memberspossess a backbone, or, more properly speaking, a spinal BACKBONED ANIMALS. 18 column, which is composed of a chain of small bones orvertebrae. Owing to this fact, the name Vertebrata hasbeen given to the sub-kingdom. The vertebrae are unitedside fiy side by means of ligaments, and as each vertebrahas an opening through its centre, asis shown at a, in Fig. 116, the chainforms a continuous canal throughoutthe entire length of the spinal column. 4. The two Tubes of Vertebrates.—Inthe spinal canal, which we have just de-scribed, lies the spinal cord, safely en-cased in bone, and connecting with thebrain through an opening in the lowerpart of the skull. You will observe,therefore, that the brain and the spinalcord, the large masses of the nervoussystem, are shut off by a special tubefrom other parts of the body. 5. Carrying this idea yet further,we will now consider the main cavit
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1887
