26 



end of the 2nd caudal segment. Left leg of last pair nearly as long as the 

 urosome, 3rd joint the longest, terminal one rather small and finely ciliated. 



Colour. Body in both sexes very pellucid, in female being banded 

 transversally with light red. Length of adult female 1.80 mm., of male 1.45 mm. 



Remarks. No doubt can arise as to this being the true Pseudocalanus 

 armatus of Boeck. If the form recorded by Brady should prove to be a different 

 species, it must consequently have another specific name. In any case these 2 

 forms are very closely related, whereas the Mediterranean form described by Dr. 

 Giesbrecht seems to differ from the Norwegian form in several respects. At the 

 base of the rostrum, for instance, there is a conspicuous thickening not found in 

 the latter form, and the posterior projections of the last segment of the metasome 

 are much coorcer, reaching, according to the figures given, beyond the 2nd caudal 

 segment. The colouring of the animal is also rather different, to judge from the 

 coloured figure given on PI. 2. 



Occurrence. Boeck found this form at Haugesund, west coast of Norway, 

 at a depth of 30 fathoms. I have myself observed it, though in rather small 

 numbers, at about the same depth in 2 different localities, viz., in the upper part 

 of the Christiania Fjord (Bundefjord), and in the Brevik Fjord near Langesund. 

 Moreover some few specimens were found in a sample of plankton taken during 

 the cruise of the "Michael Sars" in the Storfjord (Nordm0re), and in another 

 sample from Stat. 11 (north of Iceland). A solitary specimen was finally found 

 in a sample taken off the Finmark coast NW. of Nordkyn. Mr. Nordgaard has 

 observed this form in the neighbourhood of Bergen. 



Distribution. If the form recorded by Brady should in reality prove to 

 be identical with Boeck's species, the distribution of this Calanoid would be quite 

 perplexing; but I still regard the identification of these 2 forms as somewhat 

 questionable, and I should indeed be more inclined to believe that the present 

 form is exclusively a North Atlantic species. It is, however, certainly not of 

 arctic origin, since it did not occur in any of the numerous samples of plankton 

 taken during Nansen's Polar Expedition, and has never been found anywhere in 

 the Arctic Ocean. 



