4 GUSTAF EISEN, ON THE AECTIC OLIGOCH^ETA. 



From Siberia and Novaja Semlia the collection contains only four species: 



1. Allolobophora mucosa Eisen 1874. 



2. » Nordenskiöldii n. sp. 



3. » subrubicunda Eisen 1874. 



4. Dendrobama Boeckii Eisen 1874. 



Of these none was known there before. A. mucosa and subrubicunda have both 

 a wide geographical distribution, as the former is also found with certainty in Norway, 

 Sweden, Germany and New England (America). The latter, on the contrary, is known 

 in Sweden, the Azores, New Foundland and California, and is rather abundant in the 

 last mentioned country. 



D. Boeckii is also a widely distributed species, as it inhabits both Europé and 

 America (New Foundland). Besides the above species, which are known with certainty, 

 a few others from Siberia have been described or mentioned, but without having seen 

 the specimens it would be iinpossible to identify them by means of the descriptions 

 given, and I can only mention them here with a few remarks. They are : 



Lumbricus triannidaris Grube. 

 » multispinus Grube. 



» communis Auct. 



All are mentioned and described by Grube in Middendorffs Sib. Reise Bd. II. 

 Th. I. p. 18 etc. Of these L. triannidaris is certainly the best characterized speciesand pos- 

 sibly a true Lumbricus. L. communis inay perhaps be identical with Allolobophora turgida 

 or mucosa mihi. L. multispinus, on the contrary, is neither a Lumbricus nor an Allolobo- 

 phora, but may be a new genus, characterized by having five bristles in each fascicle, 

 that is, all in all, 20 bristles on each segment, or perhaps is only a large Enchytrams, 

 which in former times might have easily enough been mistaken for a Lumbricide. 



As indigenous to the eastern Siberia we find a few species mentioned by G. Gerst- 

 feldt in Mémoires de FAcad. de St. Petersbourg, Mém. d. Sav. étrangers, T. VIII. 

 pag. 268, 1858. These species are named : 



Lumbricus anatomiens Duges. 

 » brevispinus n. sp. 



» multispinus Grube. 



but they are not defined enough to be recognized or identified with any specimens at 

 my disposal. 



