20 ALICE M. BORING AND RAYMOND PEARL 
are spermatogonial cells or spermatocytes in synizesis. ‘The 
portion that resembles an ovary in external appearance has 
distinct ovarian tissue on the periphery, but the center is filled 
with tubules in an even less developed condition than those of 
the part already described (fig. 26), but distinctly testicular as 
they are filled solid with cells, not hollow like mesonephric 
tubules. On the right side of the body there is an enlargement 
of the anterior end of the Wolffian duct and this, upon being 
sectioned, appears like the center of the ovarian portion, a 
mass of small tubules with inactive cells (fig. 27). The ovarian 
portion of this organ contains oocytes of many sizes. Some 
of them are contained in normal follicles with the characteristic 
nests of lutear cells in the theca interna, but the majority are 
beginning to degenerate. Many groups of these lutear cells 
lie in the connective tissue of the stroma between the follicles 
and a few among the testis tubules at the center of the ovary 
and among the tubules of the small testis on the right. In three 
places the sections passed through atretic follicles packed with 
these cells here containing clumps of the yellow lutear pigment. 
This histological structure represents the orange spots visible 
on the surface to the naked eye. No interstitial cells were 
found in any portion of the organ. This bird is a potential 
hermaphrodite in its internal structure, a fact of especial in- 
terest in view of its hermaphroditic behavior. The structure 
looks as though it were changing from female to male. The 
oocytes are mostly starting to degenerate and some atretic 
follicles are already filled with lutear cells containing the char- 
acteristic pigment. The presence of lutear cells among the 
testis tubules looks as though the tubules were growing from 
the center outward and forcing their way into the ovarian tissue 
at the surface. But neither the ovarian or testicular tissue 
was in active condition when the bird was killed. 
No. 1349 is the second bird with hermaphrodite behavior. 
Figure 16 is a dissection of the reproductive organs. In this 
bird, they were dissected out of the body and preserved as pho- 
tographed before the Wolffian duct situation had been worked 
out, so that it is possible that the bird possessed the normal 
