. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. SKELETON. 647 process produced to sternal junction; and I shall hereafter prove that the coracoid process of the mammal scapula is as distinct a piece from the coracoid bone of the bird, as the centrum of a vertebra is from the costa. In order to understand aright the law of formation, it is as necessary to know what parts are identical and different in two or more skeletons, as it is to know what parts are identical and different in two or more verte- bras ; an error in the one or in the other is fatal to a proper under
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. SKELETON. 647 process produced to sternal junction; and I shall hereafter prove that the coracoid process of the mammal scapula is as distinct a piece from the coracoid bone of the bird, as the centrum of a vertebra is from the costa. In order to understand aright the law of formation, it is as necessary to know what parts are identical and different in two or more skeletons, as it is to know what parts are identical and different in two or more verte- bras ; an error in the one or in the other is fatal to a proper understanding of the law which governs the development of both. While we view the clavicle (b,fig. 470.) in connection with the cervical rib behind («), we then find that the entire of Jig. 470. repre- sents a quantity equal to the thoracic arche- type, inclosing a visceral or haemal space ven- trad, and a neural space dorsad. This same whole quantity of the archetype is also seen in fig. 471., where (b) the furculum joins c, the sternum, and points dorsad to a, the cervical Fig. The cervical vertebra, with the rib, a, the clavicles, b, and first sternal piece, c, of the crocodile, form- ing, in their connected totality, the sterno-costo- vertebral whole quantity. rib of the cervical vertebra. In like manner fig. 472. shows the dimensions of a thoracic Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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