[20] See W. Bateson, Quart. J. Micr. Sci. n. s. vol. XXIV. 1884, p. 208 and later; also E.W. Macbride, Ibid. vol. XXXVI. 1894, p. 385.
[21] See p. 52.
[22] A.T. Masterman, P.R. Soc. Edinb. 1895-96, p. 59; and Anat. Anz. 1896, p. 266.
[23] See E. Ray Lankester, Quart. J. Micr. Sci. vol. XXIX. n. s. 1889, p. 365. W.B. Benham, Ibid. vol. XXXV. n. s. 1893, p. 97. J.W. Kirkaldy, Ibid. vol. XXXVII. n. s. 1895, p. 303. The last-named writer divides the genus into three subgenera.
[24] See W.K. Parker On the skeleton of the Marsipobranch fishes, Phil. Trans. 1883, London.
[25] See A. Smith Woodward, Catalogue of Fossil Fish in the British Museum, Part II., 1891. A. Smith Woodward, Nat. Sci. vol. I. 1892, p. 596.
[26] See R.H. Traquair, Ann. Nat. Hist., ser. 6, vol. II. 1888, p. 485.
[27] See p. 17.
[28] R.H. Traquair, Ann. Nat. Hist. vol. VI. 1890, p. 485; P. Phys. Soc. Edinb. vol. XII. 1892-93, pp. 87-94, and 312-320. A. Smith Woodward, Nat. Sci. vol. III. p. 128, 1893.
[29] See p. 79.