BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 5. N:0 16. 13 
H. insignis n. sp. 
Characteristics the same as those of the genus. The 
oviduct is large, entirely enclosing the penis proper. The 
length of the body about 25 m.m. 
Habitat: Europe, Sweden, Motala river, in shallow 
water. 
The peculiarities of this species are very great. It re- 
sembles Psammoryctes in having a circular chamber (im- 
properly called ”vesicula seminalis”) at the top of the atrium, 
and in which the prostata opens. Like Tubifex it has hair- 
spines and forked spines, but the former are very sparingly 
distributed or even sometimes entirely wanting. Hemitubifex 
is also distinguished form all other genera in having large 
winglike glands round the base of the receptacle, a charac- 
teristie not met with any where else but in the Enchytre- 
ide. We may consider this genus as a connecting link bet- 
ween Psammoryctes and Tubifex, or Psammoryctes and Lim- 
nodrilus. 
Psammoryetes VEJDOVSKY 1875. 
VEJDOVSKY, Beitr. zur Oligochetenfauna Böhmens in Sit- 
zungsber. der Kön. Böhmischen Gesellsch. d. Wissenschaften 
TS pA LIA 
The lower end of the atrium, or that part of the same 
organ wich lies between the penis and the circular chamber, 
or vesicula seminalis, is not glandular, but long and very 
narrow. The upper end of the atrium is globular and glan- 
dular, forming a vesicula seminalis on which the prostata is 
grafted. 
As yet only one species is known viz. 
P., umbellifer KESSLER 1868. 
Syn.: 1868. dScanuris umbellifer KESSLER. Appendix to the 
Proceedings of the Association of the Naturalists 
of S:t Petersburg, pag. 103—108, published in 
russian. 
>» 1875. Psammoryctes umbellifer VEJDOVSKY 1. c. pag. 194, 
and: Ueber Psammoryctes umbellifer und ihm ver- 
