. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 77ie thoracic and ventral median line of the Orni- thorhynchus, Showing the serial homology between the coracoid bones (2), clavicles (1), ribs (3), and the marsu- pial (6) and pubic bones (5). it ? What is its interpretation ? What else, I answer, can it be, but a ventral rib, proper to some one of the lumbar vertebrae behind. If in these pages I have furnished the querist with the idea that a lumbar vertebra has lost costo-sternal quantity, then he cannot be un- productive of the idea, that this marsupial bone, which n
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 77ie thoracic and ventral median line of the Orni- thorhynchus, Showing the serial homology between the coracoid bones (2), clavicles (1), ribs (3), and the marsu- pial (6) and pubic bones (5). it ? What is its interpretation ? What else, I answer, can it be, but a ventral rib, proper to some one of the lumbar vertebrae behind. If in these pages I have furnished the querist with the idea that a lumbar vertebra has lost costo-sternal quantity, then he cannot be un- productive of the idea, that this marsupial bone, which now occupies the place of this costal quantity of the lumbar vertebra, is none other than this quantity itself. Besides this, it is also evident, from the serial order which the marsupial bone (Q,fig. 474.) holds with the line of costae (3, 8, 7), that it is itself costiform. Now, in fig. 474., it will be also seen that the pubic bone (5), and the ischiadic bone. The thoracic and ventral median line of the Crocodile (dorsal aspect}, Showing the same serial order of the. parts named in jig. 474. (1) to the ischiadic bones (4), it is scarcely possible to recognise a difference between all forms of this serial order. The clavicles (1) are succeeded by the ribs (2, 3, 8), these by the ventral ribs from (8 to 6), and these by the pubic bone (5), and the ischiadic bone(4). The homology between the bodies, (1) the clavicle, and (2) the rib, is as clearly ap- parent as between (5) the pubic bone, and (4) the ischiadic bone. Moreover, the homo- logy between (1 and 2), (5 and 4), is as clearly apparent as between any two ribs of the series. If (i>) the pubic bone still held its original place at (7), and had not discon- nected itself from the ischiadic bone (4), it. 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 T
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