319 
be described as a male with one ovary. On the right side there are 
25 gonads, all testes full of spermatozoa; but, on the left side the 
row of 25 gonads is interrupted by the presence of a single ovary 
containing numerous large ova, which could be distinguished even 
in the living animal. The remaining 24 gonads on the left side are 
all testes full of spermatozoa. As seen in the accompanying figure 1, 
it is the ninth gonad of the series which contains ova. 
This region of the body-wall was removed, and cut into longitudinal 
sections, of which one is here figured (fig. 2). The female gonad 
is seen to differ from the male not only in the presence of ova instead 
of spermatozoa, but also in the infolding of the wall so as to form 
Left side view 






S22 
UOUTES 

Gonad 25. 
Secondary 

Testis 8. Testis 9. 











Primary * Myotome 
Ectoderm 
Fig. 1. Left-side view of a hermaphrodite Amphioxus, >< 2. 
Fig. 2. Longitudinal frontal section of the body-wall and three gonads, enlarged. 
a secondary cavity. In fact this half-segment shows the complete 
structure of the typical female, such as has been described by 
ZARNIK,') and NEIDE and LEIBER.?) 
No trace of ova can be seen in the other gonads; and no trace 
of spermatozoa can be seen in the ovary. 
No other definite case of hermaphroditism seems to have been 
recorded in the Cephalochorda. It would appear, therefore, to be an 
exceedingly rare phenomenon, since numberless specimens have been 
1) B. Zarnık, „Ueber die Geschlechtsorgane von Amphioxus“. Zool, 
Jahrb. Abt. Anat., Bd. 21, 1905. 
2) L. Neer u. A. Leiser, „Über Bau und Entwicklung der weiblichen 
Geschlechtsorgane des Amphioxus.“ Zool. Jahrb. Bd. 18, 1903. 
