f 360 DK D. BERRY HART. 



present state of dispute as to the development, it would be rash 

 to attempt to push analogies here in detail. In regard to the 

 urinogenital sinus, it has to be noted that in the early fa3tus we 

 have as its upper boundary where the eminence of Milller lies, 

 on its posterior wall. The hymen forms at the Wolffian ducts 

 opening, and not at the eminence of Mliller, as usually stated. 

 I think it probable that the Wolffian bulbs block the urino- 

 genital sinus, and that the lumen is re-established as a double 

 one, urethral and vaginal, by involutions from the sinus below. 

 Thus in tlie female, the vestibule, lower third of the vagina, and 

 lower end of the urethra represent the original sinus urino- 

 genitalis. In the male, of course, all below the colliculus 

 seminalis represents it, with this difference that it forms a real 

 canal, and not practically a hypospadias as in the female, the 

 penis being greatly developed as compared with the clitoris. 

 The upper portion of the urethra and the bladder in the female, 

 and all above the sinus pocularis in the male, are of course 

 derived from primitive gut and allantois. 



I need hardly indicate that the labia majora represent the 

 scrotum split sagittally and mesially, and that the labia minora 

 are the ununited edges of the urethral groove. 



Above tlie colliculus seminalis the task of identification of 

 the analogues is fairly easy. No part of the vas deferens is 

 normally represented in the human female until we come to the 

 interval between tube and ovary, where we have the main tube 

 and tubules of the epuophoron (parovarium). The tubules of 

 the Wolffian body are represented in the female by the paro- 

 ophoron tubules at the hilum, and by the epoophoron or paro- 

 varium higher up. 



In the male we get remnants of the Wolffian body in con- 

 nection with the testicle, the well-known organ of Giraldes, or 

 paradidymis. The ducts of Milller, strictly speaking, are not in 

 my opinion represented in the male at all, except by the 

 hydatids of Morgagni and the rare cornua uteri or uterus and 

 vagina occasionally found. (Primrose.) 



The sinus pocularis represents, I believe, the junction of 

 Wolffian ducts and part of urinogenital sinus. Of course, if one 

 holds to the vagina being Milllerian in all its extent, the sinus 

 pocularis will represent the lower part of the Miillerian ducts. 



