| OCR Text |
Show 10 SEXUAL HELECTION. PAnT II. which i-· striped, as I hear from Dr. Gunther, with bdght colours. This filament docs not contain any mnsc1cs, and appar ntly cannot be of any direct nso to the fi h. As in the case of the Ca1lionymns, the mn.lcs whibt young reBcmblo in colour and structure tho adult femal . Sexual differences ·nch as these may br strictly compared with tho c whieh arc so frequent with gallinaceous bircl.·.1 r, Fig. 20. Xiphophorus IIcllcrii. Upper figure, male; lower figure, female. In a siluroicl fish, inhabitino· the fresh 'mtors of Sonth America, namely the Plecostornus barbatus 16 (fig. 80), the male has its mouth and interoperculum fringed with a beard of stiff hairr::, of which tho female shews hardly a trace. These hairs arc of the nature of scales. In another species of the same genus, soft flexible tentacles project from the front part of the head of the 15 Dr. GUnther mo.kes thiH remark; 'Co.tnlo"'ue of Fishes in the British Museum,' vol. iii. 1 Gl, p. HJ. o lli See Dr. Giintheron this gcnuf', in' Proc. Zoolog. Roc.' lSGS, p. 232. CIIAP. XII. FISllES. 11 Fig. 30· l'lecoslomus barbntus. Upper ligu•·c, beau of mnle; lower figure, female. |
