Beginners' zoology . chthe front legs are attached to thetrunk, is hardly to be called a gir-dle, as the collar bones (clavicles)are rudimentary. (They often es-cape notice during dissection, beinghidden by muscles.) The shoulderblades, the other bones of this gir-dle, are large, but relatively not sobroad toward the dorsal edge ashuman shoulder blades. The clav-icles are tiny because they are useless. Why does the catnot need as movable a shoulder as a man . The pelvic, orhip girdle, to which the hind legs are attached, is a rigidgirdle, completed above by the spinal column, to which itis imm
Beginners' zoology . chthe front legs are attached to thetrunk, is hardly to be called a gir-dle, as the collar bones (clavicles)are rudimentary. (They often es-cape notice during dissection, beinghidden by muscles.) The shoulderblades, the other bones of this gir-dle, are large, but relatively not sobroad toward the dorsal edge ashuman shoulder blades. The clav-icles are tiny because they are useless. Why does the catnot need as movable a shoulder as a man . The pelvic, orhip girdle, to which the hind legs are attached, is a rigidgirdle, completed above by the spinal column, to which itis immovably joined. Thus the powerful hind legs arejoined to the most rigid portion of the trunk. Mammals.— The cat belongs to the class Mammalia ormammals. The characteristics of the class are that theyoung are not hatched from eggs, but are borii alive^ andnourished with milk (hence have lips), and the skiti iscovered with hair. The milk glands are situated position of the class in the animal kingdom was. Fig. 338.— Claw of Cat(i) retracted by ligament, and(2) drawn down by muscleattached to lower tendon. IQO BEGlNNEhS ZOOLOGY shown when the cow was classified (p. 9). Their care forthe young, their intelhgcnce, and their abiHty to survivewhen in competition with other animals, causes the mam-mals to be considered the highest class in the animalkingdom. According to these tests, what class of vertebrates shouldra?ik -next to tnajumah? Compare the heart, the lungs,the blood, and the parental devotion of these two highestclasses of animals.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
