John Bruce MacCallum 



251 



form in the male the paradidymis or organ of Geralde, and in the female 

 the paroophoron. The Wolthan duct persists in the male as the tail of 

 the epididymis and the vas deferens, and in the female as Gartner's 

 canal. 



The Miillerian duct in the female forms the Fallopian tube and uterus. 

 In the male the middle part disappears. The anterior portion gives 

 rise to the hydatids of Morgagni, the posterior to Weber's organ. "When 

 the -whole tube persists it is called Eathke's duct. 



Transverse 

 embryo 



of 



Fig. 6 

 section 



pig- 8 mm. long. W. U., 

 Wolffian duct, Gm., 

 glomerulus, Ao.. aorta. 



3. Tubular System of "Wolffiax Body ix the Pig. 



The youngest pig's embryo I was able to obtain was 8 mm. in length. 

 At this stage the Wollhan body is fairly well formed. In Fig. 6 it is 

 shown in transverse section. It is made up of a tubu- 

 lar and a glomerular part. The glomeruli are situ- 

 ated ventro-medially throughout nearly the whole 

 length of the organ. At the posterior end they cease 

 a short distance anterior to the hindmost Wolffian 

 tubules. They are directly connected with the aorta 

 by a series of arteries which run across in a straight 

 line through the dor so-medial portion of the gland. 

 Fig. 6. The Wolffian duct runs in a slight ridge along 

 the outer ventral border of the gland, and extends 

 from the anterior end of the Wolffian body to the 

 cloaca. In its course it is slightly curved with its 

 concavity towards the median line. From it there 

 proceed at right angles a number of tubules, each of which has a lumen 

 considerably smaller than that of the duct. These have the course rep- 

 resented in Fig. 7. In this embrvo there 

 were 51 glomeruli and -12 tubules on the left 

 side; 45 glomeruli and 40 tubules on the 

 right side. 



The Wolffian body reaches its greatest 

 development when the embryo is about 40 



mm. long. From this stage to the time ^^^^ ^ Diagrammatic recon- 



when it reaches a length of 95 mm. the ^duc\'Hrom*'pTg'flSbryo'''8 mm'! 

 gland remains in about the same condition, '"'^s'- 



After this degeneration begins and changes take place which end in the 

 almost complete disappearance of the organ. 



In the Wolffian body, at the height of its development in pigs between 

 40 and 95 mm. in length, there can be recognized three main surfaces. 

 The ventro-medial and dorso-medial sides are flattened by pressure from 



