138 UNIVERSALITY OF DEGENERATIVE EVOLUTION 



proximal extremities in the shape of reduced organs, 

 the hydatid of Morgagni (hm), and the uterus 

 masculinus (ttm), neither of these being functional. 

 The intervening part of the canal remained, and 

 formed a canal which has been described by Gasser. 



We see then, that in the genito-urinary apparatus 

 of an adult male there are : 



(1) Organs which have come into existence at 

 different times, but which have retained their 

 original functions, viz. : the testes, the kidney 

 (metanephros), and the ureter ; (2) Organs which 

 are functional, but of which the ultimate function 

 differs from the original, viz. : the epididymis and 

 the vas deferens ; (3) Reduced organs, vestiges of 

 what were formerly active organs, viz. : the hydatid 

 and the paradidymis ; (4) Reduced organs, vestiges 

 of Mlillerian canal which only became active in 

 the female, viz. : the hydatid of Morgagni and the 

 male uterus. 



In the female (fig. 57, D), the development of 

 the renal part is similar to that we have just 

 described in the male. Taking first that part of 

 the mesonephros which became connected with the 

 genital gland and the corresponding discharging 

 canal, we find that the canal disappeared with but 

 rare exceptions in which it formed Gartner's duct (#.), 

 the lower part persisting in the form of a rudiment 

 (Weber's organ (ten)) ; the upper part became reduced 

 to a small tissue which surrounded the paraovarium 

 (p.), and the paraophoron (p.) vestiges of what was 



