The Descent of Man

appears from my observations of the species in
confinement, to be subservient to the same end
as the wattles, crests, and other abnormal adjuncts
of the male in gallinaceous birds, for the
purpose of fascinating their mates." (13. 'Nature,'
July 1873, p. 264.) The young males resemble
the adult females in structure and colour.
Throughout the genus Callionymus (14. 'Catalogue
of Acanth. Fishes in the British Museum,'
by Dr. Gunther, 1861, pp. 138- 151.), the male is
generally much more brightly spotted than the
female, and in several species, not only the dorsal,
but the anal fin is much elongated in the
males.
The male of the Cottus scorpius, or seascorpion,
is slenderer and smaller than the female.
There is also a great difference in colour
between them. It is difficult, as Mr. Lloyd (15.
'Game Birds of Sweden,' etc., 1867, p. 466.) remarks,
"for any one, who has not seen this fish
during the spawning-season, when its hues are