106 
by the ductus ejaculatorius as already indirectiy indicated. This 
copulatory implement is, moreoveF, not symmetrically placed in the 
body, but displaced to the one side of the antrum. Compare in 
this respect the two longitudinal sections through the male organ, 
Text-fig. 9. Ilyplana aberrans. Schematic longitudinal section of the 
genital apparatus. 45 x. agl, cyanophile giands running to the wall of 
the penis and antrum; am, antrum masculinum; c, double string of 
embryonic cells, supposed to represent a rudimentary ductus vaginalis; 
de, ductus ejaculatorius; fvs, «false seminal vesicle«; i. e. the end part 
of the large seminal canal; opr, opening of the prostatic vesicle. 
represented in text-fig. 9 and Plate IV, Fig. 22. This displacement 
of the penis can hardly be a normal case, but as only one specimen 
is at hånd, a verification of the view can only be made at some 
future date. 
Having observed this feature in the series of sections, I had at 
first intended to desist from a description of the new species, 
particularly as it could not be ranked with any of the known 
Stylochid-genera. As time has passed, my hesitation has gradually 
disappeared, for in the future even less trained investigators can 
hardly meet any sefrious difficulties in comprehending the case and 
eventually making the necessary small corrections for the probable 
abnormity of this male organ. These corrections might then at the 
utmost apply to the orientation of the penis to the middle line of 
the body and the piercing of this organ by two, sooner or later 
United, canals, representing the efferent duet of the prostatic vesicle 
and the ductus ejaculatorius. Making due allowance herefore, the 
rediscoverer of the species will have no trouble with the indentifi- 
cation. Text-figure 9 shows the entrance of the male efferent duet 
into the antrum, such as the condition actually appears in the 
sections. Next to this entrance lies the penis-like implement, figured 
in longitudinal section on Plate IV, Fig. 22. 
