. Transactions and proceedings of the New Zealand Institute . The compound sacrum contains one thoracic, five lumbar, apparentlyfour true sacral, and six caudal vertebra. As far as I can make out thesenumbers hold good for the other three genera, but in adult specimens itis not easy to decide the exact number of true sacrals. Behind the lastankylosed caudal vertebra come four free caudals; from the analogy of theallied genera these were probably followed by two or three ordinary vertebraeand a pygostyle. Sternum and Shoulder-girdle. The sternum of Notornis, as shown by the above table of compa
. Transactions and proceedings of the New Zealand Institute . The compound sacrum contains one thoracic, five lumbar, apparentlyfour true sacral, and six caudal vertebra. As far as I can make out thesenumbers hold good for the other three genera, but in adult specimens itis not easy to decide the exact number of true sacrals. Behind the lastankylosed caudal vertebra come four free caudals; from the analogy of theallied genera these were probably followed by two or three ordinary vertebraeand a pygostyle. Sternum and Shoulder-girdle. The sternum of Notornis, as shown by the above table of comparativemeasurements, and by pi. XX., is as nearly as possible of the same propor-tional length as that of Trihonyx, while it is considerably longer than that ofOcydronms, and shorter than that of Porphyrio. Its breadth, proportionallyto length of trunk, is considerably greater than in either of the three alliedgenera. The proportions of the sternum are, however, best seen by reducingit in all four genera to the same absolute length ; this is done in figs. 4. del. TO ILLUSWM TRANS f{,VOLXimiZ.
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