. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 642 SKELETON. and enclosing thoracic space completely, ap- special design of an ophidian hyoid apparatus, pears the new apparatus named hyoid. The By an actual necessity, therefore, and in the absence of the sternum and sternal ends of relationship of cause and effect, it appears the ribs becomes the presence of the simple that the presence of a hyoid apparatus (1,2 Fig. The. cervical spine of the osseous Fish, Exhibiting the hyoid apparatus 1, 2, 3, 4, as being the original costo-sternal quantity proper to those v
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 642 SKELETON. and enclosing thoracic space completely, ap- special design of an ophidian hyoid apparatus, pears the new apparatus named hyoid. The By an actual necessity, therefore, and in the absence of the sternum and sternal ends of relationship of cause and effect, it appears the ribs becomes the presence of the simple that the presence of a hyoid apparatus (1,2 Fig. The. cervical spine of the osseous Fish, Exhibiting the hyoid apparatus 1, 2, 3, 4, as being the original costo-sternal quantity proper to those vertebras which immediately succeed the occiput. In both Jigs. 462. and 463. the parts indicated in dotted outline are those quantities of the archetypal series of sterno-costo- vertebral circles which, being subtracted, give to both fonns their class characters. If such parts still existed for both fonns, these would approach the original character of plus uniformity, and thereby would leave no distinction between the hyoid apparatus, 1, 2, 3, 4, and the thoracic apparatus, 5, 6, 7. In both figures it will be marked that the variable number of hyoid circles depends upon the variable number of those costae which have suffered metamorphosis. of Jig. 462.) must be the metamorphosis of a costal apparatus at those spinal segments which immediately succeed the occiput, and the same appears true of every other special apparatus produced upon the skeleton form. The appearance of any or all kinds of special apparatus implies the metamorphosis of all or some of the costal and sternal quantities. Consequently, therefore, it must follow that as the original costo-sternal apparatus of the cervical spinal segments may be regarded as homologous with the thoracic costo-sternal apparatus, so will the hyoid apparatus (I, 2, 3, 4, Jig. 463.), which is constructed of the cervical costo-sternal quantity, bear some analogy, more or less, to the thoracic appa- ratus (5, 6, 7, 8, 9, 10,). In
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