an oval form, the largest diameter of the oval being situated laterally, as in Plate 3, Fig: 1 & 2. In some cases, the lateral notch, and the enlargement of the hole is combined, to effect the same purpose. One or other of these contrivances may be observed in the dorsal or lumbar portion of all birds, although they obtain in a less degree, where the motion is more divided, than when there is only one or two vertebrae moveable; this may be observed in a very striking degree in the silver pheasant, the cavities of the two articulations formed by the single vertebra are very deep, and admit no doubt of the arrangement being made to facilitate lateral motion.
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On Motion in the lumbar division of the spine of birds, by George Oakley Fleming , 1846. From The Royal Society, AP/28/6
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