8 



SEXUAL SELECTIOX. 



[Part II. 



onct, was considered by Linnaeus and by many subse- 

 quent naturalists as a distinct species; it is of a dingy 



Fig. 28.— Callionymns Ijra. Upper fifrurc, male ; lower figure, female. 



reddish-brown, with the dorsal fin brown and the other 

 fins Avhite, The sexes difier also in the proportional size 

 of the head and month, and in the position of the eyes ; " 

 but the most striking diftcrcnce is the extraordinary elon- 

 gation in the male (Fig. 28) of the dorsal fin. The young 

 males resemble, in stiucture and color, the adult females. 

 Throughout the genus Callionymus," the male is gcner- 



" I have drawn up this description from Yarrcll's 'British Fishes,' 

 vol. i. 1836, pp. 261,266. 



" ' Catalogue of Acanth. Fishes in the British Museum,' by Dr. 

 Gunther, 1861, pp. 138-151. 



