614 Mr. W. Riddell on a’ 
more posterior seetions are the more markedly female. The 
depth of the sections varies from 5°7 to 6°3 mm., corre- 
sponding to a body-length of somewhere about 5 cm. probably. 
In spite of the scantiness of the material, these sections 
present several features of interest. 
We may begin with such a section as that shown in fig. 1. 
At the first glance this appears to pass through an ordinary 
male pouch on either side. Closer examination shows that in 
no ease are both these testes normal. There are always 
well-marked ova present in some portion of one or both 
gonads, sometimes clearly visible under even low power, but 
sometimes requiring a fairly high power to detect them, as 
when the ova are small or the section contains little but the 
nucleus more or less masked by the spermatozoa. ‘Thus the 
upper border of the left-hand testis in fig. 1 shows a distinct 
ovum. None such is visible in the testis of the other side 
: Fig. 2. 
Lm. 
O-0O$mm. 
under this magnification, but examination of its inner border 
under a higher power reveals their presence (fig. 2). So far 
as I can determine, these ova, in such a case as the last, are 
to be looked for near the inner border of the gonad, dorsal to 
the vessel—that is to say, they occur in the region of the 
“Nabel”* or hilum, the original place of attachment of 
the gonad. 
Other sections show more complicated conditions. Fig. 3 
represents a gonad where the main mass of the tissue is still 
male, but showing clear invasion by ova. In such a case as 
this the testis appears to be more or less broken up and 
invaded by strands of tissue, which carry the ova, in various 
stages of maturity, into its interior. A still more complicated 
condition is shown in fig. 4. Here the most of the gonad is 
* Neidert u. Leiber, “Geschl.-org, des Amphiorus,” Zool. Jahrb. 
(Anat.) xviii. 1908 ; Zarnik, “‘ Geschl.-org. von Amphiovus,” Zool. Jahrb. 
(Anat.) xxi. 1905. 
