SEX STUDIES. XI 15 
the tubules look like testicular structures, but they may in- 
stead be mesonephric, a condition which might be found in 
an embryonic ovary. In fact, it looks much like the ovary of 
the just-hatched chick shown in figure 32. The presence 
of the lutear cells in groups in the stroma also suggest arrested 
development, as in the normal development of the egg follicle, 
there is a stage before the theca layers are added when only the 
granulosa is present, but the nests of lutear cells are conspicuous 
in the stroma near the young follicles. Although the lutear cells 
are present they have not gone through their full development, 
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Fig. D Portion of connective tissue core of gonad from. 1428, showing num- 
erous, interstitial cells (* 264). 
as there is no trace of the yellow pigment in any part of the 
gonad. The dissection of 1427 is shown in figure 12. The 
two Wolffian ducts are shown in the photograph, the right one 
with a distinctly enlarged anterior end, which is of the nature 
of a mass of mesonephric tubules or parovarium, as shown by 
section. This bird has also a coiled oviduct and a lobulated 
reproductive organ on the left. Here again is a large dark 
tumor posterior to the reproductive organ as in 1429. Figure 
21 is a section of this organ. It seems largely composed of 
solid cords of cells. There are no oocytes and no hollow tubes, 
