146 



Sex-Reversal in Frogs and Toads 



Right gonad. An ovo-testis. To the outer border of the larger 

 testis-portion the smaller ovary-portion was attached. 



Left gonad. An ovo-testis, having the form of a normal-sized six- 

 lobed ovary which had a small nodule of spermatic tissue attached to 

 the middle of its inner border. 



Vasa efferentia of the usual male pattern. 



Seminal vesicles present, being small and spindle-shaped. 



Mullerian ducts well-developed. 



On. section of the left gonad (it was assumed that the right was 

 similar), the testis-portion, discrete from the ovary-portion, showed the 

 structure of normal testis ; the ovary-portion contained large numbers 

 of ova, some immature, some mature, and many showing various stages 

 of degeneration, being associated with black pigment. 



7. Smith. R. temjwraria. Adult. Secondary sexual characters male 

 but imperfectly developed. (The skin below the throat was lighter on 

 the left side ; the typically male pad was present on the index finger of 

 the right side only.) 



Fig. 7. Fig. 8. 



Right gonad. An ovo-testis. The larger testis-portion presented 

 several constrictions upon its surface and bore along the outer border 

 the smaller ovary-portion, on the surface of which the outlines of ova 

 could be distinguished. 



