27 
extend. fee ur.tror seminal vesicle has a larg r las o than the ducts 
thesselres, and shows som oi^na of- preparing to branch at its anterior 
end. In this ease the Wolffian ducts show little ef-ect of the rale 
horacne, and were presumably so far advanced in festal® differentiation 
that they were already d generated in cose regions, before the ss&le 
hormone started V- act* But tha development of th* antricr casinal 
vesicle is a sale characteristic. 
In the 17*0 cm, free-nartin (Fig* 83), the Wolffian duct I®, 
continuous froa the front of tha mesonephros to the region of the 
uterus where it is interrupted In four places. The left is better 
developed then the right, but both have the interruptions. They are 
again interrupted in the region of the anterior seminal vesicle, which, 
though one of four on each side, develops in the true sale fashion, 
and :?v«n branches at its anterior end into tubules with a coat distinct 
free that of the genital cord, but like it- The three posterior di¬ 
verticula on each aide, prisordia of ucoensory seninal vesicles as 
in feealos, are sacra narked tha*: in the 16*6 os- female (Fig. 10)* 
Of all these nominal vesicles, the anterior one on each side is 
siailar to those of a younger scale, and the lent three are sorely 
imperfectly stimulate - growth centres held over from tne female 
period and not inhibited completely as in the sale* The lucen of 
the posterior part of the Wolffian duct extends forward to where the 
anterior seminal vehicle cornea off on ouch sid • In this free-mariifl 
we hmve a^ain a c ndition int«r»»diate between that of a female and 
that of a younger Bale. The supernumerary serlnal vesicles are 
cheroot ristic of females, whereas the ant rior seminal vesicle 
eondition and the continuous aatrio** end of the duct ars distinctly 
sale* 
The 20*0 cm* fr e-aartin has the nost extreme modification in 
the male direction of the five studied (Fig. 24)* The ?olffian ducts 
