HERMAPHRODITISM IN EURYCEA BISLINEATA. 355 



thing beneath them, making their removal necessary for the study 

 of the gonads. The right gonad is the larger and in a macroscopic 

 examination seems to be primarily a testis with characteristic pig- 

 mentation and conspicuous lobules. The pigmentation is, how- 

 ever, somewhat lighter in color than that usually found in the adult 

 testis. The length of the testicular portion of the right gonad is 

 4 mm., while that of the testis shown in Fig. i A is 5.25 mm. 

 Posterior to this testicular portion, occurs a more slender unpig- 

 mented structure in which ten large unmistakable ova, together 

 with smaller ones, may be seen. Its general resemblance to an 

 ovary is seen by comparison with the ovaries of the 60 mm. adult 

 female shown in Fig. I C. 



The left gonad is longer and more slender as a whole than the 

 right. This is due to the greater length of the ovarian part, the 

 testicular region being smaller than that of the right gonad (2.75 

 mm. as compared with 4 mm.). Moreover the testicular pig- 

 mentation is confined to the anterior region of the gonad and is 

 still lighter in color than that of the right gonad. The character- 

 istic lobules are present, but there is less differentiation of the 

 testicular from the ovarian region, the two seeming to grade into 

 each other insensibly. In this gonad 14 large ova are in evidence 

 as well as numerous smaller ones. At the extreme posterior end 

 of the left gonad there is a small semi-detached ovarian lobe. 



The hermaphrodite had not been preserved originally for histo- 

 logical study, since the animal had been killed in 5 per cent, for- 

 malin and had been kept in this fluid since 1915. Nevertheless the 

 gonads were -sectioned, and, in spite of the excessive shrinking 

 which is especially evident in the separation of the cysts which 

 make up the testicular lobules, the characteristic structure of both 

 the male and the female components was shown with unmistakable 

 clearness. 



Figure 4 shows a cross section through a region where, in a 

 macroscopic examination, the right gonad had the appearance of 

 a testis and the left one the appearance of an ovary. In general 

 this section shows the typical testicular structure of the right 

 gonad, with lobules, each made up of a number of component cysts 

 of male cells, arranged radially about a central collecting duct. A 

 single large ovum appears in the section, however, completely fill 

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