14 EISEN, PRELIM. REPORT ON GEN. AND SPEC. OF TUBIFICIDA. 
wandte Gattungen, Zeitschr. wiss. Zool. Bd. 27, 
PENNE 
The spines are of 4 kinds, viz. two kinds of forked 
spines, hair-spines and comb-like spines. 
For other characteristics see the excellent monograph of 
this genus by VEJDOVSKY. 
Habitat: Europe, England, Russia, Bohemia, France, — 
probably widely distributed. 
'Tubifex LAMARCK 1818. 
The cephalic ganglion both anteriorly and posteriorly 
emarginated. Both penis-sheath and oviduct present. The 
oviduct is wide and short. Two kinds of spines: hair-spines 
and forked spines. In the lower fascicles only forked spines, 
in the upper ones sometimes both forked and hair-spines. 
As can be seen the above characteristics are neither very 
pointed, nor at all sufficient to characterize the genus; but 
the different descriptions of the species supposed to belong 
to this genus differ in so many principal points, that generic 
characteristics can for the present be given only in a nega- 
tive way, the exterior characteristics being at present the 
principal ones. 
If we therefore unite under one genus all species of the 
Tubificide, which have only two kinds of spines, viz. hair- 
spines and forked spines, and which besides have none of 
the principal characteristics of the other genera, — we find 
them to be the following: 
T, rivulorum DUDEKEM 1859. 
Syn.: TT. rivulorum DUDEKEM J. Hist. nat. du Tubifex des 
ruisseaux. Mem. cour. de V'Acad. de Belgique. Tome 
XNVI, 1859. 
Habitat: Europe. 
T, coccineus VEJDOVsSKY 18723. 
Syn.: T. coccineus Verb. «Beiträge zur Oligochetenfauna 
Böhmens 1. ce. p. 193. 
This and the following species are said to have the re- 
ceptacle in the 1l0Oth segment and the sexual porus in the 
