154 Sex- Reversal in Frogs and Toads 



posterior halves, and bearing along the anterior part of its outer border 

 the strongly pigmented ovary-portion. 



Left gonad. A testis of unusual shape. 



Vasa efferentia of the male pattern present on both sides. 



Seminal vesicles were present but were of unequal development, the 

 left one being the larger. 



Mlillerian ducts. The right one was well-developed and much con- 

 voluted, but its uterine segment was small and non-pigmented. The left 

 one was rudimentary and straight, but possessed a well-defined though 

 small non-pigmented uterine segment. 



On section the right gonad was seen to be composed of two discrete 

 portions. The testis-portion consisted everywhere of normal spermatic 

 tissue, but the ovarian was pathological. The left gonad was spermatic 

 in structure, but throughout the gland ova were found some within and 

 others between the seminal tubules. The presence of an ovum within 

 a tubule was associated with deformity of the spermatozoa, which were 

 obviously compressed. The presence of an ovum between seminal 

 tubules was associated with fibrous overgrowth in the intertubular con- 

 nective-tissue, and this produced deformity of the tubules in the 

 neighbourhood. There was ciliated epithelium upon the peritoneum. 



18. Huxley. (2.) R.temporaria. Adult. Killed October. Secondary 

 sexual characters typically male. 



Right gonad. An irregularly shaped testis with uneven outlines and 

 a scarred surface. 



Left gonad. An ovo-testis. A three-lobed testis-portion twisted 

 upon itself, bore a prominent crest of pathological ovarian tissue upon 

 its outer border. 



Vasa efferentia of the usual male pattern on both sides. 



Seminal vesicles were present but were small and fusiform. 



Miillerian ducts. Right one weakly developed and convoluted and 

 with a well-defined and pigmented uterine segment. The left one was 

 well-developed. 



On section, the right gonad had the structure of ordinary spermatic 

 tissue save that six ova were found, two actually within and the rest 

 between seminal tubules. Some of these ova had a normal appearance, 

 others were degenerate. Accumulations of jjigment, ovarian in origin, 

 were found also between seminal tubules. 



The left gonad consisted of an inner normal testis-portion and an 

 outer pathological ovary-portion. The two were quite discrete and the 

 ovary-portion contained but few ova and all of these were degenerate. 



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