HERMAPHRODITISM IN SPELERPES BISLIXKATUS. 



133 



tion, of course, of the two which contain a large ovum apiece. 

 Most of these cysts are composed of spermatogonia of the last 

 generation, having round or oval nuclei with the chromatin 

 arranged in an irregular network. Nucleoli appear in a few 

 cells of one section. The spermatogonia resemble Kingsbury's 

 Figs, i and 2 ('02). In a few cysts, all the cells are undergoing 

 mitosis. These do not resemble the maturation mitoses described 

 for Desmognathus, and are probably spermatogonial divisions. 



P 



FIG. 3. Horizontal section through right gonad of hermaphrodite, < 280. 

 / = follicle cell, / = lobule, subdivided into six cysts of spermatogonia, o = ovum, 

 p = peritoneum, spg = spermatogonium, spin = spermatogonial mitosis. 



In other cysts the nuclei are in the "contracted" condition, 

 described by Kingsbury (Fig. 18), occasionally occurring in 

 Desmognathus fusca at the beginning of the period of growth of 

 spermatogonia into spermatocytes and more commonly, in (hat 

 species, in the last generation of spermatocytes. Fig. 3 shows 

 an egg filling one lobule and surrounded by follicle cells. In 

 this case, as well as in the left gonad, the relation to follicle cells 

 and to peritoneum is normal. The adjacent lobules show sper- 



