HERMAPHRODITISM IN SPELERPES BISLIXEATUS. 



is of two types. Macroscopically, the anterior part of the left 

 gonad, which is much reduced in size, resembles the normal testis 

 in texture, though not in shape, while the posterior region is 

 distinctly like an ovary. The larger ova in this latter region, 

 indicated in outline in Fig. I, B, are six in number. 



Fig. i, C, is a camera drawing of the ovaries and kidneys of 

 a normal 46 mm. larva, collected in September, showing the 

 arrangement of eggs, for comparison with'their arrangement 

 in the posterior region of the left gonad of the hermaphrodite. 

 In each normal ovary the larger ova lie approximately in two 

 rows, one lateral and one medial. A dozen or fifteen on each 

 side are appreciably larger than the others. These larger ones, 

 as may be deduced from a comparison with the ova in specimens 

 of adult female Spelerpes, collected in September, are of the 

 size and state of development which indicate that they would 

 normally have been deposited a year from the following spring 

 as the first brood of this individual, while the next smaller ones 

 would have been deposited two years from the following spring. 



The larger ova in the left gonad of the hermaphrodite are 

 about the size of the smaller ova in the normal ovaries, though 

 their irregularity in shape, especially where large numbers of 

 eggs are packed together, makes exact measurements impossible. 

 The ova of both the normal specimen and the hermaphrodite 

 have their long axes parallel to the longitudinal axis of the body. 

 This diameter, as measured from sections, is .15 to .20 mm. 

 while the shorter diameter, at right angles to the long axis, 

 averages about .12 mm. The largest ova found in the herma- 

 phrodite are, in development, a year behind the largest ova in 

 a normal female having the same total length, collected at the 

 same time, and therefore, presumably, of the same age. Beside 

 these ova, there are oogonia in the left gonad of the herma- 

 phrodite, similar to those in the normal ovary which have not 

 yet begun to elaborate yolk (Fig. 2). The relation of ova to 

 follicle cells and to peritoneum in the hermaphrodite is like that 

 in the normal ovary. 



Although smaller than the right testis, the anterior portion 

 of the left gonad has somewhat the structure of the normal male 

 gland. The elongated mass is composed of too few loulebs to 



