160 Sex- Reversal in Frogs and Toads 



On section, the testis-portions had the structure of normal spermatic 

 tissue ; while all the larger ova within the ovary-portions showed de- 

 generative changes. 



Group D2. Both gonads testes, normal in appearance. 



38. Spengel. Bomhinator igneus. Adult. In an otherwise normal 

 male, the right Miillerian duct was as well-developed as the oviduct of 

 a female and the left, though smaller, was abnormally large. 



C. PELOBATES. 

 Division II. Secondary Sexual Characters Typically Male. 



Group (72. On inspection one gonad an ovo-testis, the other a testis of 

 normal appearance. 



39. Spengel. Pelohates fuscus. Adult. Secondary sexual characters 

 typically male. 



Right gonad. A normal testis. 



Left gonad. An ovo-testis of which the posterior part consisted of a 

 2-lobed ovary, containing pigmented ova of the size of normal mature 

 ova. 



Accessory sexual apparatus as that of a normal male. 



Miillerian ducts extremely rudimentary. 



D. HYLA. 

 Division II. Secondary Sexual Characters Typically Male. 

 Group D2. Both gonads testes, normal in appearance. 



40. Sweet. Ilyla aurea. Adult. Secondary sexual characters 

 typically male. 



Right and left gonads both testes normal in appearance. 



In addition to the usual male accessory sexual apparatus, Miillerian 

 ducts were present, being well-developed, but having no posterior 

 openings. 



On section, ova were found within both testes. 



The species and the extent of the abnormality. 



The species which contributed the abnormalities and the nature of 

 the abnormality are shown in the following Table : 



