168 Helen Dean King. 
matocytes and spermatids in various stages of development. A careful 
study of many cysts failed to show a single instance in which the 
development of the germ-cells appeared to be abnormal. The cysts 
in the centre of the testes are not crowded quite as closely together 
as are the cysts in the testes of the normal male, and the stroma 
separating them is unusually thick; in all other respects the testes 
appear perfectly normal. Each testis was connected with the kidney 
by vasa efferentia, the genital ducts appearing normal. In this 
individual the Miillerian ducts were still present; but, although 
they were quite large and much convoluted, they showed no dilatations 
either in the anterior or in the posterior region. 
Interest in this individual centers in the structure of the rudimen- 
tary ovaries lying above and attached to the testis on either side. 
A B 
Photographs of the right (A) and of the left (B) ovo-testis found in an 
adult Bufo lentiginosus. O, ovary; T, testis; C. A, corpora adiposa. 
The position of these bodies and the fact that no Bidder’s organs 
are to be found indicate that they have been produced, in part at 
least, from the cells which ordinarily form Bidder’s organ. Since 
in this individual the testes are somewhat shorter than those usually 
found in adult males, it seems probable that primordial germ-cells 
in the anterior part of the germinal ridge, which normally would 
have developed into spermatozoa, joined with the cells of Bidder’s 
organ to form these rudimentary ovaries. The force, whatever its 
nature, which modified the development of the cells and brought 
about the formation of these rudimentary ovaries must have acted 
