142 



Sex-Reversal in Frogs and Toads 



2. YouNGMAN. R. te)iipo7^aria. Adult. Killed June. Secondary 

 sexual characters male but poorly developed. 



Right gonad. An ovo-testis. An ovoid non-pigmented testis-portion 

 suspended from the ventral surface of a small but apparently normal 

 ovary. 



Left gonad. An ovary of normal appearance. • 



Vasa efferentia. " There appears no means of exit to the exterior for 

 the spermatozoa, unless they burst into the coelom, for I can make out 

 neither macroscopically nor microscopically by sections, any trace of vasa 

 efferentia, and sections of the ureter do not show the presence of sper- 

 matozoa therein." 



Seminal vesicles not present. 



Fig. 1. 



Fig. 2. 



Mlillerian ducts exceedingly well-developed with eggs within the 

 convoluted portions of each and with uterine segments crammed to dis- 

 tension. 



On section. Left ovary and the dorsal ovary portion of the right 

 gonad showed the following structure. Numerous normal ova were pre- 

 sent, but there were also cavities among the ordinary egg-containing 

 chambers, and of the same size, which were filled with black pigment 

 (" representing perhaps degenerate eggs "). The ventral testis-portion of 

 the ovo-testis showed testicular structure, and contained immature and 

 mature spermatozoa and, in addition, peculiar eosinophilous bodies. 



