BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 93. N:O 16. 5) 
tiplicity of its prostata-glands, the entire spines etc. point 
towards the family of Lumbriculide, but the invaginated ovi- 
duet connects the genus with Tubificide, and I can not even 
consider the genus as the missing link between the two fa- 
milies, but believe that as such we will discover genera 
with two pairs of efferent ducts, situated in two successive 
segments. I will here take the oportunity of saying a few 
words in regard to the vexed question of the invagination 
of the oviduct. 
That the invagination of the oviduct is a reality, is with 
certainty shown by VEJDOVSKY, who has succeeded in finding 
the ova in situ in a sack surrounding the penis proper or 
one of its sheaths. But the true interior opening of the 
oviduct has not previously been discovered, and the supposi- 
tion, that it was situated at the upper end of the atrium 
seemed always improbable, especially as no real opening 
could here be observed. In deciding upon what really is 
the oviduct, observations must be made especially on two 
parts, first: on the interior aperture of the oviduct, secondly 
on the existence of ova in the oviduct, and if possible on 
their entrance through the interior aperture of the same. 
Without having observed these points in the same species, 
if possible, the problem in question cannot be considered 
as solved, and all observations in other directions can be of 
merely approximate value. VEJDOVSKY”) has certainly seen 
the ova in situ, but has not observed the interior aperture 
of the oviduct, nor the ova entering the same, and the sack- 
like organ figured by him and spoken of as the oviduct, 
may not be the real oviduct but only a sack-like covering of 
the same. 
I have, myself, in all the species I have dissected, found 
what I believe to be the true oviduet and its interior 
aperture, but as I have never discovered any ova in situ, 
having however dissected hundreds of specimens, the ques- 
tion can not as yet be considered solved, but only brought 
a step nearer its solution. I must defer to a more elaborate 
treatise the discussion of this subject, as my arguments 
would not be well understood without frequent reference 
being made to numerous minute drawings, the publicatior (OA 
which does not enter in the plan of this preliminary report. 
+y Zeitschr. f. w. Zoologie. Bd. XXVII. Taf. VIII 
