[6]

Comptes Rendus Tom XLVI. 1858 p. 353.

Dr. Dufossé says in 2 sp. of Ophidium the ♂ alone have an apparatus fitted for producing sounds, consistng of the swim-bladder, which is provided with certain moveable bones & proper muscles - Ophidium belongs to the Acanthopterigians. Certain fish produce sounds by the friction of the upper & low pharyngeal bones.

[in margin:] p. 354 Os pharyngiens superieurs sur les inferieurs

Tom XLVII. 1858 p. 916. Certain other fishes voluntarily produce sounds by the vibration of certain muscles, which are united by connective tissue with their swim bladder & this latter serves as a responding apparatus - apparently not sexual

Tom LIV. 1862 p. 393 certain other fishes voluntarily produce sounds by the vibration of the intrinsic muscle of their swim bladder - Trigla this produces various sounds which comprise nearly an octave. - Trigla lucerna one of best - Speaks of these sounds as being pure & long-continued

Dufossé, Léon. 1858-1862. Des différents phénomènes physiologiques nommés voix des poissons. Comptes rendus hebdomadaires des séances de l'Académie des sciences 46: 352-356; 47 (1858): 916; 54 (1862): 393-395. Cited in Descent 2d ed., p. 347n. See Paully, Darwin's fishes. 2004.