THE ORGANS OP THE MIDDLE GEEM-LATER. 



Fig. 230. 



401 



dt&r 



Figs. 230 and 231. — Six stages in the development of the external sexual organs in the male and 



the female, after the Ecker-Ziegler wax models. 

 Pig. 230^ and 5. — Two stages in yi'hich a difference of the sexes is not yet to be recognised, 



S from an embryo 8 weeks old. 

 Fig. 231. — The two stages iV/and, M* exhibit the metamorphosis of the original fundament in 



the male in embryos 2^ and 3 months old respectively. The stages IV and Jf * present the 



metamorphosis in the female (2^ and 4^ months). 

 The same designations are used for all of the figures. 

 Atf, Posterior paired extremity ; do, cloaca ; gh, genital eminence ; gf, genital fold ; gr, genital 



groove ; gw, genital ridges ; gp, glans penis ; cl, clitoris ; d, perinseum ; a, anus ; ug, entrance ■ 



to sinus urogenitalis or vestibulum vaginae ; vv, vestibulum vaginas ; vh, foreskin (prepuce) ; 



hs, scrotum ; d £ r, raxjhe perinei and scroti ; gsch^ labia majora ; ksch, labia minora. 



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