For recent accounts of the anatomy, embryology, and ethology, cf. C. H. Eigenmann, Bull. U.S. Fish Comm. for 1892, p. 381, and Arch. Entwickelungsmech. iv. 1896, p. 125.

[717]

It has recently been ascertained, on a large number of specimens, that in the African species the female alone performs the buccal nursing duties.

[718]

Cf. Monograph by J. Pellegrin (Paris, 1904).

[719]

Gerbe, Rev. et Mag. de Zool. xvi. 1864, p. 255.

[720]

Zool. Garten, 1867, p. 148. See also Verrill, Amer. Journ. Sci. (4) iii. 1897, p. 136.

[721]