COMPLETE SEX-REVERSAL IN VIVIPAROUS TELEOST. IO9 



ovarian cavity. From it cells proliferate and form sex cords in 

 sex-reversal cases. 



6. The epithelium of the ovarian cavity is derived from the 

 peritoneal epithelium and at no time is infiltrated with primordial 

 germ cells. 



7. The position, structure and physiology of the testis of the 

 transformed fish is identical to that of the "normal" males. 

 The oviduct becomes the spermduct. 



8. No tubercular lesions or lesions of any other disease were 

 found in the arrhenoid fishes. 



9. Chromosomes are not considered as having the function of 

 sex determination and control. 



10. Sex is determined and controlled by the sex hormones 

 derived from the ovary and testes. 



11. Any agent or condition which tends to decrease the 

 capacity for hormone secretion becomes an immediate factor 

 in sex-reversal. 



BIBLIOGRAPHY. 

 Blacher, L. J. 



'26 The Dependence of Secondary Sex-characters upon Testicular Hormones 



in Lebistes reticulatus. BIOL. BULL. (In press). 

 Champy, M. Ch. 



'21 Changement experimental du sexe chez le Triton alpestris Laur. De 



L'acad. des Sci., Tome 172. 

 Chidester, F. E. 



'17 Hermaphroditism in Fundulus heterocHtus. Anat. Rec., Vol. 12, p. 389. 

 Crew, F. A. E. 



'21 Sex-reversal in Frogs and Toads. A review of the recorded cases of ab- 

 normality of reproductive system and an account of a breeding experi- 

 ment. Jour. Genetics, Vol. n. 

 Crew, F. A. E. 



'23 Studies in Intersexuality. Part II. Sex-reversal in the Fowl. Proc. 



Roy. Soc., B. Vol. 95, p. 256. 

 Eigenmann, C. H. 



'96 Sex-Differentiation in the Viviparous Teleost Cymatogaster . Arch. f. 



Entw. Med., Bd. IV, p. 125. 

 Essenberg, J. M. 



'23 Sex-Differentiation in the Viviparous Teleost Xiphophorus helleri Heckel. 



BIOL. BULL., Vol. 45. P- 46. 

 Essenberg, J. M. 



'26 Complete Sex-Reversal in the Domestic Fowl. Anat. Record (In press). 



Fell, Honor B. 



'23 Histological Studies on the Gonads of the Fowl. I. The Histological 

 Basis of Sex-Reversal. Brit. Jour. Exp. Biol., Vol. i, p. 97. 



