3 
bitants of Spitzbergen and!) (1877) treats of the species observed 
during the last English arctic expedition in the Allert and the 
Discovery. Finally I wish to draw special attention to the publi- 
cations of Prof. G. O. Sars *) (1877 and 79), in which no less than 
13 species are enumerated. These are the species collected during 
the Norwegian North-atlantic expeditions of 1876, 77 and 78; the 
number of new species is seven (four of Nymphon, one of Colos- 
sendeis, one of Ascorhynchus and one of Pallene). During these 
expeditions no less than 375 Stations have been explored by sound- 
ing, dredging and trawling and for every branch of Zoology a vast 
amount of material was procured. 
During the cruises of the “Willem Barents”” the total number of 
dredgings organised was about 30, and 14 of these procured Pyc- 
nogonids. With exception of N®. 3 (off Bear Island) of the first 
cruise (1878) all the Stations from which Pyenogonids were obtained 
are situated in that part of the North-Arctie Ocean, which is called 
Barents-Sea and which has Spitzbergen and Franz Joseph Land to 
the North and Novaja Semlja to the Rast. The Pyenogonids obtained 
from these dredgings are more remarkable for quantity than great 
variety: only eight species are represented and of these only one — 
as far as I could ascertain — is new to science. Hardly any of 
these species has been hitherto thoroughly described; so I believe 
it will not be considered superfluous, when I try to supply this 
want. To study the geographical distribution of a group of ma- 
rine animals the first ihing we want is a thorough knowledge of 
the species in question, the amount of variation they show etc. 
Before passing to the detailed description of the species dredged in 
1) Miers, (E. J.), Report on the Crustacea Collected by the Naturalists of 
the Arct. Exped. of 1875/76. Ann. und Mag. of Nat. Hist. IV Series. XX. 1877. 
2) Sars (G. O.), Prodromus descriptionis Crustaceorum et Pycnogonidarum, 
quae in expeditione Norvegica anno 1876 observavit. Arch. f. Math. of Natur- 
vid. 11. 1877. 
Sars, (G. O.), Crustacea et Pycenogonida nova in itinere 2do et 3tio expedi- 
tionis Norvegicae, Anno 1877 & 78 collecta. Arch. f. Math. of Naturvid. 
IV. 1879. 
