. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. The cervical spine of the Ornithorhynchus, Showing that b the eoracoid bone, d the clavicle, and e the sternal end of the rib, are serial homo- logues. we not regard the pieces 1,2,3,4,5, con- tinued serially into the rib of 6, as being cos- tiform likewise, despite the fact that anato- mists have already regarded the pieces 1 and 2 as the eoracoid and clavicular bones ? Do we not see in fig. 469. that the parts 1, 2, 3, 4, 5 point to the parts a, b, c, d, e, just as the part 6 points to the part/? If it be said that the
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. The cervical spine of the Ornithorhynchus, Showing that b the eoracoid bone, d the clavicle, and e the sternal end of the rib, are serial homo- logues. we not regard the pieces 1,2,3,4,5, con- tinued serially into the rib of 6, as being cos- tiform likewise, despite the fact that anato- mists have already regarded the pieces 1 and 2 as the eoracoid and clavicular bones ? Do we not see in fig. 469. that the parts 1, 2, 3, 4, 5 point to the parts a, b, c, d, e, just as the part 6 points to the part/? If it be said that the parts 1 and 2 (the eoracoid and clavicle), being disconnected from the cervical ribs (a and b) are therefore to be regarded as quantities unrelated originally to a, b, I must doubt whether this can efface from the rational mind the belief that the now separated pieces a, 1 or b, 2, taken as whole quantities, equal the costo-sternal formf, 6. Whether or not the above-mentioned interpretation as to the origin of the bones called clavicle and eoracoid be true, must be seen through the facts as they are here recorded: but be this interpretation as it may, I plainly affirm that the comparative anatomist has no positive evidence, near or remote, directly or indirectly, either by a similarity of structure, or function, or po- sition, or aught else, to regard the cora- F-ig. 77ie cervical spine of a Lizard, In which the cervical ribs, a, b, c, d, e, point to the eoracoid bone 1, the clavicle 2, and the pieces marked 3, 4, 5, as their proper continuations, and just as the sternal rib, 6, continues the vertebral rib, f, to the sternal median line. coid process of the human scapula as the counterpart of the bone (d fig. 466.) called eoracoid in the bird, or of 2, the eoracoid of fig. 469., the reptile.* The anatomist may just as well call the sternum a series of vertebrae (a statement by-the-by which some * On referring to the " Homologies of the Verte- brate Skeleton,"
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