180 On a Hermaphrodite Frog. 



spermatozoa. The patch was almost isolated from the rest of 

 the glanrl, and at one spot (PI. IX. fig. 3, or.) contained a well- 

 developed ovum. It was also devoid of pigment except near 

 its attachment to the main gland. The vasa efferentia entered 

 into functional relation with it. With the exception of this 

 small patch the gland consisted entirely of ovarian tissue 

 containing ova up to "7 millim. in diameter. Vasa efferentia 

 pass-id to it as well as to the small testis portion. The fat- 

 body was well developed. Lastly, it should be mentioned 

 that the male glandular enlargement on the fore foot was 

 well marked on both sides. 



One of the chief points of interest with regard to this 

 specimen lies in the completeness of the hermaphroditic con- 

 dition in the ducts, associated with a sharp distinction be- 

 tween the sexual characters of the glands. This is the more 

 remarkable, as at the time the animal was killed (the middle 

 of February) the breeding-season was not far distant, and 

 yet neither gland ap])ears to show any very marked prepon- 

 derance over the other. Though on the whole the testis 

 seems more developed than the ovary, it is ])ossitde that the 

 peculiar sexual manifestation of activity in this specimen 

 would, had life continued, have been determined by chance 

 in the shape of the sex of the first frog which happened to 

 cross its path. 



A full bibliography on this subject is given by F. J. Cole 

 in the Aiiat. Anzeiger, Bd. xi. (1895). 



Gatty Marine Laboratory, 



St. Andrews. 



EXPLANATION UF PLATE IX. 



Fig. 1 . Dissection of the generative organs, slightly enlarged. The upper 

 portions ol the kidneys are not shown. The Miillerian ducts 

 have shrunk in the spirit and are not so thick as in the fresh 

 state. 

 fb. Fat-body. t. Testis. 



tVc. Inferior vena cava. ve. Vasa efferentia. 



A". Kidney. vs. Vesicula seminalis. 



o. Ovary. ut. L'terine dilatation. 



ovd. Oviduct. * Ovarian patch on testis. 



ovdo. Opening of oviduct. t Testicular patch on ovary. 



r. Rectum. 



Fig. 2. Section through the i. u patch on the testis, x 30. 



hv. Blood-vessel. pg. Pigment. 



do. Degenerate ovum(?). st. Seminal tubules. 



ov. Ovum. ve. Vasa efferentia. 



Fig, 3. Section through the testicular patch on the ovary, x ■'•iO. Letters 

 as in preceding figure. 



