Ill 



10) Latter. Male with right testis smaller than usual. Seminal 

 vesicles. Miillerian ducts entirely devoid of convolutions. Left 

 Miillerian duct the larger and had the larger lumen. No anterior 

 aperture of oviducts, and only traces of uterine dilatations. 

 Sections showed ova in both testes (some in seminiferous tubules). 



11) EiSMOND. A young normal male with ova in various stages of 

 development in testis (only one examined). Frog destroyed 

 before its hermaphrodite nature was discovered. 



12) MiTROPHANOw (13). Male with two well developed normal ovi- 

 ducts. Both testes under normal size, with the left much larger 

 than the right. Vasa eiferentia and seminal vesicles. Mitro- 

 PHANOw suggests from his sections that a peculiar lobe at the 

 anterior end of the right testis may be a rudimentary Bidder's 

 organ. Right testis also contained large cells which are con- 

 sidered as ova, and certainly one true ovum (48 by -57 mm) 

 situated in a seminiferous tubule. The left testis contained 

 doubtful ova only. 



13) Sumner. Male with two small but considerably convoluted ovi- 

 ducts. Uterine segments. Four openings into cloaca, but no 

 anterior openings of Miillerian ducts into body cavity. No 

 sections were cut of the testis. — A second frog is described 

 which presented the characters of a normal male plus two very 

 minute but slightly convoluted oviducts. 



Note. A good diagnostic feature as regards sex is the seminal 

 vesicle, which has only been observed in hermaphrodites predomi- 

 nantly male. 



I have to express my indebtedness to Prof. Ewart, F. R. S., in 

 whose laboratory this work was conduoted. 



August 1895. 



Literature. 



1) BouENE, A. G., "On certain abnormalities in the common Frog (R. t em- 

 por aria)". Q. J. M. S., Vol. 24, Jan. 1884, p. 83. 



2) Marshall, A. M., "On certain abnormal conditions of the reproductive 

 organs in the Frog". Journ. Anat. and Phys,, Vol. 18, Jan. 1884, 

 p. 121. 



3) Spkngel, J. W., Biolog. Centralbl., Bd. 4, Jan. 1884, p. 235—268, 



4) Sutton, J. B., Journ. Anat. and Phys., Vol. 19, Jan. 1885, p. 129. 



5) Matthews, J. D., Ibid., Vol. 19, Jan. 1885, p. 146. 



6) Kent, A. F. S., "A case of abnormal development of the reproductive 

 organs in the Frog" (Species not mentioned). Ibid., Vol. 19, July 1885, 

 p. 347. 



