162 THE MICROSCOPICAL NEWS. 
to have found its way into the uterus, while the other was seen 
moving about in the ovary; but though I have used the best 
appliances at my command with the utmost care, I have failed to 
discover either spermatozoa or the cells (spermospores) from which 
they are derived within the testis. 
Wagener describes a male genital armature consisting of a pyri- 
form or sub-spherical sac, the external orifice of which is sur- 
rounded in a radial manner by from eight to sixteen hooklets, the 
points of which are directed towards the orifice. On the bottom 
of the sac a minute pyriform body, perforated longitudinally, is 
situated. This is the so-called penis. None of the specimens 
which I have examined have possessed this organ, and it is re- 
— SI 
Fig. 53. 
markable that Wagener himself confesses his inability to trace any 
connection between the testis and the penis. ‘The marked absence 
of spermatozoa in the testis, and the non-existence of the genital 
armature in all of the large number of specimens examined, has 
led me to think that the function of reproduction must be per- 
formed asexually during the winter months, and that sexual repro- 
duction may possibly occur during the summer. Unfortunately, 
Wagener does not tell us at what period of the year his researches 
were carried out. The segmentation of the ovum appears to be 
extremely irregular and complicated, and I am not at present able 
to do more than mention a few of the leading features of its 
development. The ovum at the beginning of segmentation 
