28 



inferiority in number, size, &c. On account of the importance of 

 light to the vegetable plancton world, the quantity of food, in 

 summer at any rate, will be greatest in the surface strata; conse- 

 quently a certain species will here find the best conditions of life, 

 if the stay there is not rendered impossible by the physical con- 

 ditions. In this connection I should also mention that for instance 

 calinus hyperljoreus from the surface of the sea at Jan Mayn had 

 very red coloured antennae, while those of specimens from Bergen 

 and Lofoten were colourless. 



The arctic copepods, c. hyperboreus, metridia longa, euchceta 

 norvegica, heterochwta norvegica, seem to occur at our coast through- 

 out the year, and their occurrence need not at all be dependent 

 on transportation by arctic currents. When, on the contrary, such 

 animals as clio borealis and limacina helicina, on rare occasions 

 occur in our w-aters (according to statements by Boeck and Saes), 

 it seems to me to support the opinion that some times arctic cur- 

 rents force their way up to our coasts. 



I have mentioned above that the winter plancton is rather 

 poor. There may, however, even in the month of February in 

 Lofoten occur rather many forms. As an instance of this, I give 

 a list of the contents of the samples from Liland (Ofoten-fjord) 

 and Tjeldsundet. The diatomacea;, dinoflagellata, tintinnodea, &c. 

 have been determined by Mr. J0egensen of Bergen. 



Liland, Tjeldsundet, 



Febr. 24th 1897. Febr. 24th 1897. 

 0—300 m, 0—200 m. 



Copepoda. 



Calanus finmarchicus, Gunn c c 



— hyperboreus, Kr0yer -\- -j- 



Metridia longa, Lubb r 



Euchaeta norvegica, Boeck r r 



Oithona similis, Glaus c 



Microsetella atlantica, Brady & Rob. . . c -(- 



Larvae of copepods r 



Chsetognatha r 



Diatomaeeae. 



Chtetoceros boreale. Bail rr rr 



— criophilum, Castr rr 



— decipiens, CI r rr 



— diadema, (P]hrb.) Gran .... r 

 Goscinodiscus radiatus, Ehrl) r r 



— oculus iridis, Ehrb rr 



— concinnus, W. Sm r r 



Striatella unipunctata, Ag r 



Skeletonema costatum, (Grcv.) CI rr 



Campylodiscus Thuretii, Breb rr 



Navicula latissima, Greg r 



Thalassiothrix longissima, CI r 



Dinoflagellata. 



Ceratium tripos, (0. F. Midi.) Nitzsch. -f + 



v. bucephalus, Cl + -f" 



Liland, Tjeldsundet, 



Febr. 24th 1897. Febr. 24th 1897. 



0—300 m. 0—200 m. 



V. macroceros, (Ehrb.) Clap, et Lachm. r r 



V. arcticus, (Ehrb.) Clap, et Lachm. . . -|- c 



G. fusus, (Ehrb.) Duj r r 



G. furca, (Ehrb.) Duj r r 



Peridinium divergens, Ehrb -(- -f- 



— pellucidum, (Bergh) Schiitt. -{- t 

 Gonyaulax spinifera, (Clap, et Lachm.) 



Dies r r 



Dinophysis norvegica. Clap, et Lachm. r 



— acuta, Ehrb r r 



Tintinnodea. 



Ampliorella subulata, (Ehrb.) Dad rr 



Tintinnopsis nitida, Brandt r r 



— beroidca, Stein rr 



Gyttarocylis denticulata, (ClapetLachm.) 



Fol r r 



V. edentata, (Bi'andt) rr 



v. rotundata n. v r 



Ptychocylis urnula, ((!lap. et Lachm.) 



Brandt r 



Radiolaria. 



Challengeria tridens, Hck r r 



Acantharia, sp + -|- 



Eucecryphalus, sp rr 



Chiorophyeeae. 



Halosphsera Yiridis, Schmitz 4~ + 



The signs above, as well as in the tables, have the following 

 signification : 



rr very rare 



r rare 



4- rather common 



c common 



cc very common 



After the above was in the hands of the printer, I had an 

 opportunity of seeing the great work of dr. Vakhofeen on "Die 

 Fauna und Flora Gr0nlands"'''O. I see there that Vanhoffen in 

 Karajak-fjoi-d has found the male of calanus liyferhorcus as well as 

 the male (one specimen) of lieteroehceta norvegica. The total length 

 of the latter was .3.57 nun., it was consequently a little bigger than 

 my specimen. Vanhoffen also emphasizes the likeness with h. abys- 

 salis, Giesb. I am, however, inclined to suppose them to be two 

 different species, and I also suppose that the identity of the h. 

 spinifrons described by Bkady and h. norvegica, cannot be main- 

 tained with certainty. 



*) Gronlands-Expedition der Gesellsclmft fin- Erdkvmde zu Berlin, 1891- 

 1893, unter Leitung von Erich von Drygalski. 



