466 CATHARINE LINES CHAPIN 



section through its widest region is one-fourth the area of the 

 central cross section of the aforesaid ovary and one-eighth that 

 of the testis. 



The medulla of this 16.3 cm. free-martin is relatively small, 

 being little wider than the rete (fig. 8). It is about the size 

 of the medulla in the 12.5 cm. free-martin T26, previously 

 described. It shows little sign of differentiation, but occa- 

 sional primary follicles are found. In some of these the vacuo- 

 lated condition of the contained germ cell suggests degeneration, 

 in this point, resembling the medullary cords of the female. 

 The rete enters the gonad at the anterior end. It is prominent 

 and well developed. The more anterior rete cords have lumina. 

 The albuginea can hardly be distinguished from the undiffer- 

 entiated sex cord region. Especially is this the case in the an- 

 terior part, where the medullary region is little specialized (fig. 

 7). The albuginea looks like a compact layer of connective 

 tissue, whereas the medullary region looks like a loose mass of 

 connective tissue. Farther posterior, the medulla has a more 

 dense structure, though still homogeneous and undifferentiated, 

 and the albuginea is quite distinct, a relatively wide and com- 

 pact layer. It should be noted that, as is true of the other 

 free-martins investigated, only one set of sex cords is found. 

 No second set, corresponding to the cords of Pfliiger, the cortex 

 of the ovary, is ever developed. 



Anterior to the gonad, the Wolffian body of the free-martin 

 seems to have the relations found normally in the male. The 

 Wolffian tubules connect the rete with the Wolffian duct, as in 

 the epididymis. These tubules, however, are smaller than those 



Fig. 7 Cross section through Wolffian body and anterior end of gonad of 16.3 

 cm. free-martin, T6. 1, degenerating Wolffian tubule; 2, fold of peritoneum 

 overhanging- gonad and in which Wolffian duct normally lies; 3, albuginea; 4, 

 rete; 5, sex cord (medullary cord). X 42. 



Fig. 8 Cross section through Wolffian body and middle of gonad of 16.3 cm. 

 free-martin, T6. 1, degenerating Wolffian tubule; 2, Wolffian tubule not yet 

 degenerated; 3, urogenital fold; 4, rete; 5, sex cord region, showing little differ- 

 entiation into cords; 6, albuginea. X 42. 



Fig. 9 Cross section through epididymis of 24 cm. cf Bos embryo, T4. 1, 

 vas epididymis; 2, rete; 3, vasa efferentia; 4, spermatic artery. X 20. 



