J\. rich series of Oligochasta from Siberia and Norway, carefully collected by the 

 Swedish Arctic expeditions, and well preserved, has been kindly placed at my disposal 

 by Prof. Nordenskiöld, witb the request to determine the species and describe what- 

 ever a doser examination might reveal new or interesting. The collection, pre- 

 served in alcohol, consists principally of specimens from the families: Lumbricidae 

 and Enchytraeidas, but also of a single species of Lumbriculidse. 



Our present knowledge of the Oligochseta from Siberia, or even of the Oli- 

 gochaata in general, hardly permits a comparison between the species of different 

 countries. A few species of Lumbricus and Enchytraaus from Siberia and Northern 

 Russia have, however, been described a few years ago, but this, it is to be regretted, 

 has been done so imperfectly, that it would be very hazardous to try to identify 

 any one of them with the species in the collection now before me. 



Regarding our limited knowledge of the geographical distribution of the species 

 and families it may perhaps be best to consider every family separately, and thus com- 

 pare them with the corresponcling one in the neighbouring countries. 



Fam. I. LUMBRICID.E. 



As far as I know, the following species of Lumbricidae have hitherto been found 

 in Norway: 



1. Lumbricus terrestris L. (ex parte) 1758. 



2. » rubellus Hoffmr 1843. 



3. Allolobophora turgida Eisen 1874. 



4. » norvegica Eisen 1874. 



5. » • mucosa Eisen 1874. 



6. » arborea Eisen 1874. 



7. » foetida Sav. 1828. 



8. Dendrobcena Boeckii Eisen 1874. 



9. Allurus tetraedrus Sav. 1828. 



During the expeditions the species numbered 2, 3, 5, 6 and 8 were collected. 

 A. mucosa and D. Boeckii are also known to inhabit Siberia, and all the species except 

 A. norvegica are also found in Sweden and some of them in northern Europé generally. 



