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INEZ WHIPPLE WILDER AND ELIZABETH BARRETT PEABODY. 



as shown by the presence of a spermatheca in the dorsal wall of 

 the cloaca, and the shape of the head. The appearance of the 

 gonads in situ is shown in Fig. I B. For comparison, a typical 

 ovary and a typical testis from animals of approximately the same 

 size and collected at the same time (July 3, 1915) are shown in 

 Figs, i A and I C. The smaller size of both testicular and ovarian 

 parts of the ovo-testis as compared with the typical male and fe- 

 male gonad respectively will be noted. Moreover, while the repro- 

 ductive ducts (Wolffian and Miillerian respectively) of the normal 

 male and female have approximately the form characteristic of 



m- 



FIG. 3. Cross section showing (m) the Miillerian and (.') the Wolffian 

 ducts in the adult hermaphrodite (cf. Fig. i B) (X 400). 



the mature condition, the hermaphrodite showed macroscopically 

 apparently a single slender straight duct upon each side following 

 the lateral border of the mesonephros. Subsequent microscopic 

 examinations of cross sections of this, however, revealed the pres- 

 ence of two ducts (cf. Fig. 3) the more lateral of which, the Mul- 

 lerian, alone persists anterior to the mesonephros. This sexually 

 indifferent condition of the ducts is identical with that shown by 

 cross sections, made previous to this investigation, through the 

 body of a 66 mm. immature adult male, the testes of which also 

 correspond histologically almost exactly to the testicular portions 

 of the hermaphroditic gonad and were thus used as a typical male 

 control in the microscopic study. 



The fat bodies in the hermaphrodite were especially large, and 

 when the body cavity was first opened completely obscured every- 



