. The structure and classification of birds . Teia. 166 Skull or Heliornis. Ventkal and Lateral Views.(Aftek Beddabd.) Fio. 167.—Skull of View. (AfterBeddabd.) than in the rails, while the pubes are ankylosed at least atone point with the ischia. There are a considerable number of extinct rails, manyof which were flightless, thus showing an exaggeration of a 380 STRUCTUEE AND CLASSIFICATION OP BIEDS tendency of many existing rails which either do not flymuch or are but feebly fitted for flying. It is particularly upon small islands that these flightlessrails have been discovered

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. The structure and classification of birds . Teia. 166 Skull or Heliornis. Ventkal and Lateral Views.(Aftek Beddabd.) Fio. 167.—Skull of View. (AfterBeddabd.) than in the rails, while the pubes are ankylosed at least atone point with the ischia. There are a considerable number of extinct rails, manyof which were flightless, thus showing an exaggeration of a 380 STRUCTUEE AND CLASSIFICATION OP BIEDS tendency of many existing rails which either do not flymuch or are but feebly fitted for flying. It is particularly upon small islands that these flightlessrails have been discovered, both living and fossil, and inislands where loss of flight may be regarded as having beenof less importance as a disadvantage in the struggle forexistence. Thus in New Zealand there was (until recently)the large Notornis, whose skeleton has been described by T. ^ The last living specimen was taken in 1879. Fromthe Chatham Islands are known Palceolimnas chathamensisand Nesolivmas Dieffenbachii. The skeletons of these railshave be

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898