16 EISEN, PRELIM. REPORT ON GEN. AND SPEC. OF TUBIFICIDAZ. 
T. campanulatus n. sp 
Fig. 2, 
The cephalic ganglion is longer than broad and in front 
considerably broader than behind, where the emargination is 
deep and narrow. The penis is broadest at the middle, from 
here tapering toward the end. The penis-sheath is of the 
same shape as the penis. The oviduct is bell-shaped, the 
widest end being turned towards the exterior porus. The 
length of the oviduct is only half that of the penis, but its 
width at the widest end is nearly three times that of the 
penis. The receptacle is bent in the shape of an 5, with 
the upper end enlarged and sack-like. The limbs of the 
forked spines are of nearly the same length and width. The 
length of the body about 15 m.m. 
Habitat: Sweden: Scania, Christianstad, in ponds or dit- 
ches near the town. 
Limnodrilus CLAPAREÉEDE 1862. 
The cephalic ganglion emarginated both in front and 
behind. The lower end of the atrium is generally long and 
narrow, and comparatively narrower than the corresponding 
part of Tubifex and Ilyodrilus. The copulative organs are 
not surrounded by spiral muscles, generally by longitudinal, 
seldom by circular ones. 
The principal characteristics of the genus is evidently 
the total absence of hair-spines. In all other respects the 
genus seems to resemble Tubifex. It is however likely that 
when a larger number of species has been studied, new and 
more distinct characteristics may be discovered. A promi- 
nent feature of Limnodrilus and Camptodrilus is also the 
elongation of the copulative organs. In other genera the said 
organs are in general comparatively shorter, and especially 
the oviduct is in Tubifex unusually wide and short. 
In the following synoptic table the two species L. Hoff- 
meisteri and L. Udekemianus are not classified. However 
carefully described by CLAPAREDE, several points in their 
organisation remain as yet unknown, especially what concerns 
the reproductive organs, the penis and the oviduct, with their 
respective sheaths. These species scem to be most nearly rela- 
ted to L. monticola and alpestris. 
