. The descent of man and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. 320 PEXUAL SELECTION'. [Part II. from iIr' left-hand 0110, the hwiw rescmblinir \n Us sim- ple tapering joints the antennjij of the female, "in tlic male the modified antemia is cither swollen in the middle or ano-u- larly l)ent, or converted (fig. 3) into an elegant, and sometimes wonderfully complex, prehensile organ.' It serves, as I hear from Sir J. Lubbock, to hold the fe- male, and Ibr this same purpose one of tho two i)Osterior legs on the same side of the body Ih converted
. The descent of man and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. 320 PEXUAL SELECTION'. [Part II. from iIr' left-hand 0110, the hwiw rescmblinir \n Us sim- ple tapering joints the antennjij of the female, "in tlic male the modified antemia is cither swollen in the middle or ano-u- larly l)ent, or converted (fig. 3) into an elegant, and sometimes wonderfully complex, prehensile organ.' It serves, as I hear from Sir J. Lubbock, to hold the fe- male, and Ibr this same purpose one of tho two i)Osterior legs on the same side of the body Ih converted into a forceps. In an- other family the inferior or pos- terior antenna? are " curiously zig- zagged" in tlic males alone. In the higher crustaceans the anterior legs form a pair of chelai or pincers, and these are gener- ally larger in the male than in the female. In many species the ""'^ ^TfrotJtSk?""''"' ^'^'^'^^ the opposite sides of the a. Part of ri-rht-hand nntorior body are of Unequal sizc. the rin-ht- nntoiina of male, formiii- a , *, i ⢠-r ⢠prehcnHilo orimii. Jiaud ouc bciuff, as I am mformed 6. Posterior pair of tliC thoracic , t\ c â r, ctTflofmaie. oy Mr. U. bpcncc I5ate, erencrallv, c. Ditto of female. ^, , . , , ' . tliough not mvanably, the largest. This inequality is often much greater in the male than in the female. The two cIicUt also often differ in stnicturc (tigs. 4, 5 and G), the smaller one resembling those of the fe- male. What advantage is gained by their inequality in size ' See Sir J. Lubbock in * Annals, ond Mag. of Nat. Hist.' vol. xi. 1853, pis. i. and x.; and vol. xii. (1853) pi. vii. Sec aUo Lubbock'in ⢠Ent. Sf)c.' vol. iv. new gerica, 185C»-1858, p. 8. With respect to the zig- zapged antennae mentioned below, Fee Fritz Miiller, ' Facts and Argu- menta for Darwin,' 1869, p. 40, Please note that these images are extracted from scanned page images that may have been digitall
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