Primitive Animals

Cover Primitive Animals
Primitive Animals
Geoffrey Smith
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Among the more important of these features are, the possession of a covering of hair in place of the reptilian scales ; associated with this character is the warm blood, kept at a constant temperature ; the teeth arise in at most two successions, whereas in Reptiles they may be replaced an indefinite number of times, and whereas in the Reptiles the teeth are all simple cones, in the Mammal they are differentiated into several different kinds, incisors in front for cutting, canines for de- fence..., premolars and molars for grinding. In the skeleton a large number of peculiarities might be enumerated. The vertebrae are divided into a con- stant number of cervical, dorsal, lumbar and sacral vertebrae ; the skull articulates with the vertebral column by two occipital condyles, instead of one ; the brain cavity is greatly enlarged, a sign of superior THE RISE OF THE MAMMALIA 109 mental powers ; the articulation of the upper and lower jaws has shifted from the quadrate and articular bones to the squamosal and dentary.

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