BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 9. N:O 16. Ö 
are not connected by anastomosing transversal nerves. The 
spines are of several kinds, the short ones always forked. 
Phereceptaele opens in the 9Yth and the efferent duet in 
the lÖth setigerous segment (at least so in all the species I 
have investigated). 
Key to. tie” Genera. 
I. More than one kind of spines present, viz. hair-spines, comb- 
like spines, and forked spines; two of which kinds are 
always present (see however Hemitubifex). 
A. The cephalic ganglion anteriorly furnished with a large 
conical processus. The spermatophores are extremely 
long and spirally coiled. The oviduct is single. 
Spirosperma bp. 
B. The cephalic ganglion not furnished with an anterior 
conical processus. The spermatophores are short and 
broad and not coiled. 
a. The efferent duct comparatively short and broad, 
never much longer than the atrium and copulative 
organs together. No differentiated hearts. 
TIlyodrilus n. 
b. The efferent duet comparatively long and narrow, 
always longer than the atrium and the copulative or- 
gans together. 
1. The base of the receptacle is furnished with glands. 
The efferent duct or atrium furnished with a large 
vesicula seminalis. Hair-spines and forked spines, 
but the former not always present. No comb-like 
spines. The middle part of the atrium is glandular. 
Hemitubifex n. 
2 The base of the receptacle not furnished with 
glands. The middle part of the atrium not glan- 
dular. Atrium furnished with a vesicula seminalis. 
Three kinds of spines always present. 
Psammoryctes VEJDOVSKY. 
No ”olands at: the base of the receptacle.: The 
middle part of the atrium not glandular. No vesi- 
cula seminalis. Two kinds of spines viz. hair- 
spines and forked spines. 
oc 
Tubifex LAMARCE. 
