[90] Free use has been made of L.C. Miall's Studies in Comparative Anatomy, I., The Skull in Crocodilia, London, 1878. See also W.K. Parker, Tr. Z.S., vol. XI. 1885, p. 263.
[91] See pp. 214 and 215.
[92] These terms are defined on p. 199.
[93] E.T. Newton, Phil. Trans. vol. CLXXXIV, B, p. 431 (1893).
[94] M. Fürbringer, Untersuchungen zur Morphologie und Systematik der Vögel, I. and II. Amsterdam, 1888. Cf. H. Gadow, Nature, XXXIX. 1888, pp. 150 and 177.
T.H. Huxley, "On the classification of birds." P.Z.S., London, 1867.
E. Selenka and H. Gadow, Vögel in Bronn's Classen und Ordnungen des Thierreichs 1869-1890.
[95] See p. 283.
[96] R. Owen, Phil. Trans., vol. CLIII., p. 33; 1863. T.H. Huxley, P. R.S., vol. XVI., p. 243; 1868. C. Vogt, Rev. Scient., ser. 2, tom. 9, p. 241; 1879. C.H. Hurst, Nat. Sci., vol. III., p. 275; 1893; vol. VI., pp. 112, 180, 244; 1895. W.P. Pycraft, Nat. Sci., vol. V., pp. 350 and 437; 1894; and vol. VIII., p. 261; 1896.
[97] According to Hurst the fourth and fifth digits are also present.