BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 56 N:0 16. 15 
llth. T. rivulorum and T. campanulatus on the contrary have 
the same organs in the setigerous segments 9 & 10, or in 
one segment nearer the cephalic lobe. TI can not account 
for this seeming difference in any other way than that the 
respective investigators have counted the segments in diffe- 
rent ways. DUDEKEM, as it seems, and myself, count the 
first setigerous segment as the ”first” segment of the body, 
and accordingly we find the receptacle to be situated in the 
Ith, and the sexual porus in the 10th segment. ÖULAPAREDE 
and VEJDOVSKY on the contrary consider the buccal segment 
as the first segment, and accordingly find the sexual porus 
situated in the 1lith segment and the receptacele in the 
10th. 
I have, to prevent further mistakes and in order to 
simplify the counting of the segments, here adopted the plan 
to name the two segments around the oval opening respec- 
tively ”cephalic lobe” and ”buceal lobe”, and to assign the 
name of ”the first segment” only to the first setigerous seg- 
ment. In the single species of the true genus Tubifex, that 
I have had opportunity to examine, the receptacle is situated 
in the th and the sexual porus in the lOth setigerous seg- 
ment, and I have reason to believe that the same is the rule 
in all the species of the genus Tubifex. 
To avoid all possible mistakes it would be well if every 
investigator wrote, after the segment in question: ”setigerous” 
or, ”counted from the front-lobe of the worm”, or any thing 
else, by which his views on the subject could be immediately 
ascertained without going to the trouble to look all through 
the work, preface, notes and all! 
T. Bonneti CLraPr. 1862. 
Syn.: T. Bonneti ÖCLAPAREDE. Recherches sur V'Anatomie 
des Oligochétes pag. 230. Mém. de la Soc. de Phys. 
et d' Hist. nat. de Geneve, Tome 6. 
The most characteristic feature of this species seems to 
be the vase-like form of its oviduct, which is of about the 
same length as the penis proper. 
Habitat: Europe, Switzerland. 
