Günther, Trans. Zool. Soc. vi. 1869, p. 437.
Ibid., Study of Fishes, Edinburgh, 1880, p. 191.
Ibid. p. 192.
Ibid. p. 190.
Lendenfeld, Chall. Reports, Zool. xxii. 1887, p. 277. For references to papers by Leydig, Ussow, Emery, and others, see Lendenfeld, op. cit.