144 Sex- Reversal in Frogs and Toads 



misshapen and the intertiibular connective-tissue in this area was 

 hyperplastic. 



There was ciliated epithelium upon the peritoneum, and the ova 

 within the Mullerian ducts were all degenerate. 



4. Crew^. (1.) R. temporaiia. Adult. Killed April. Secondary 

 sexual characters male but imperfectly developed. 



Right gonad. An ovary, somewhat firmer and more strongly pig- 

 mented than usual. 



Left gonad. An ovo-testis, having the appearance of an ovary rather 

 more deeply pigmented and firmer to the touch than usual, which bore 

 along its inner border three small nodules of testis-substance. 



Vasa efferentia^few in number— were present on either side. 



Seminal vesicles were present, being small and fusiform. 



Mullerian ducts very well-developed, ova within uterine segments 

 and convoluted portions. 



On section. Right ovary and ovary -portion of the left gonad entirely 

 ovarian in structure, but practically all of the more mature ova showed 

 signs of degenerative changes. There was widespread increase of the 

 pigment normally present in an ovary and the connective-tissue was 

 distinctly hyperplastic. The three nodules upon the inner border of the 

 left gonad had the structure of normal spermatic tissue. 



There were ciliated cells upon the peritoneum. The Mullerian ducts 

 contained only degenerate and spurious ova. 



5. Marshall. (D.) R. temporaria. Adult. Secondary sexual cha- 

 racters not described. 



Right gonad. An ovo-testis. The larger testis-portion had the 

 ovarian tissue disposed along its outer border. The body of the testis- 

 portion presented upon its ventral surface a very deep transverse groove. 

 At the anterior end of the ovary-portion was a deeply pigmented lobule 

 which was bent back over the dorsal surface of the gonad. 



Left gonad. An ovary more strongly pigmented than usual and 

 divided into six lobes by well-marked constrictions. 



Vasa efferentia on the right side as those of the normal male ; two 

 or three thin-walled tubules connected the left ovary to its kidney. 



Seminal vesicles not present. 



Mullerian ducts well-developed. 



On section, the greater part of the right gonad had the structure of 

 normal testis. The pigmented band, which ran along its outer border, 

 extended inwards about a quarter of the way through the substance of 

 the testis, and consisted of masses of pigment which followed the lines 



