Protistplauktoii. 



scarce oil' the Faoroo Islands. Also kimwii iVimi the I'arilic Ocean. 

 Ilu' liuliaii Ocean and the Red Sea. 



C. liiirntinii (lliiitn.) Cl. 



Is undoubtedly a Kood species. 



ivare and scarce, almost entirely absent (hiiiiiL' the diatom in- 

 tlow in the sprini;-. 



Distrihiifion: Oceanic I'onn. principally distriluited in the war- 

 nier part of the temperate Atlantic, northwards (in the auluuni, ac- 

 oordinsr to Clevb) to Icelaml and (.'reenlaiid. Very rare round 

 the Faeroe Islands. Often rather fre(|uenl on the west coast of 

 Norway. Also known from thi' Ked Sea and the Indian Ocean. 

 In the north eastern Atlantic found as far as the sea between 

 Tronrsd and .Ian .Mayen (J.)I!(;i:nskn L. ;il>. p. .-ii;, rr). 



C. fnsas (KuRii.) Ur.i. 



\"ery fri'ipient and often in ([uantities, only less numerous dur- 

 ing the spriuii diatom iuHow. Found by Gkan frequently at several 

 places on the north coast in the months of July— October 1898—99. 



Distribution : Temperate, oceanic form, widely distributed from 

 the southern part of the temperate Atlantic to the North Sea, 

 (rather fre(iueut in the English Channel in the months of Febru- 

 ai-y and May 1903) Skag-erack, Cattet;at, the lialtic, the west coast 

 of Norway, Scotland, the Faeroe Islands, Iceland and right up to 

 Hiiren Eiland and Spitzbergeu (1900). Rather common round the 

 Faeroe Islands. Numerous on the west coast of Norway, especially 

 in late autumn. 



HI- iPtearros^jenrma-baceae. 



Pterospernisi Poi cb. 



These remai'kable organisms arc probably, as Clevk and others 

 have suggested, resting stages. As far as I know, no one has up 

 to the present found anything to indicate where they really belong. 



With us. there are others (occurring sparsely) besides the three 

 mentioned below, but I have not entered them. 



P. Mobii (.JOKG.) OSTENI'. 



OsTKNF. L. 117, p. lot. Ptrrosjihivm MiJbii Ji'mon^sEV h. 91, 

 p. 48. 



Rather frequent, but generally sparsely. 



Bit-tributioii: Not .sufficiently known. Seems to be a tempe- 

 rate Atlantic form. Very rare round the Faeroe Islands. Also 

 rare on the west coast of Norway. 



P. VanhiSffcnii (Jurc.) Ostenf. 



OsTEXF. L. 117, p. 1.51. Ptciosphæm V. .Ioegensex 1. c. 

 Rather more fre(|uent than the foregoing, and often rathei- numerous. 



Distribulton : Like the foregoing. Seems to be an oceanic 

 form. Very rare on the west coast of Norway 1898. 



P. dictyon (J org.) Ostenf. 



Ostene. 1. c. I'trrosphwra dictyon Jciiu;. 1. c. As a rule the 

 most frequent form, though often occurring in smaller quantities 

 than the forcijoinu- one. 



Dlslnlinln.i 

 ■ritic form, 

 id thi' Faen 



il<e lli(! foregoing .species, but perhaps rather 

 ueiit on the west coast of Noi'way, very rare 



X'V- I3:a/losi>li.ae3raQeae. 



llahtMpliJi'ra virjilis Sciimit/.. 



Inch //. uuiior OsTKNE. 



In his last work (Jk.vn (I^. To, p. 12-l(;j has subjected this 

 species to a thorough, comprehensive treatment. I agree, on the 

 whole, with his conclusions, as they — as far as I am able to 

 judge — corre.spond very avcII to my own observations. I am also 

 on account of his statements convinced that the large, inner body 

 previously referred to by me (L. 91, p. If.) and which 1 with some 

 doubt took to be the nucleus, is only an accidental formation, caused 

 by imperfect preservation and treatment (plasmolysis). 



Unfortunately, I have not later had any opportunity of exami- 

 ning the moving spores, as the large (piantitics of Hulosplwra which 

 were met with near P.orgen in 189s have not since leappeared (as far 

 as I know). 



Common, often in (pumtities, scarce dniing the spring diatom 

 inflow, especially in 1899. 



Distribution: Temperate and tropical oceanic species, widely 

 distributed in the warmer part of the Atlantic and especially (cfr. 

 Gean 1. c.) in the eastern part of the Gulf Sti'cam from the 

 Faeroe — Shetland channel to the far north of Xoi-way and I'idit up 

 to Baren Eiland. 



According to Ceeve also west of .\meiica. in the .Mediterraneau 

 and the Indian Ocean. 



iTlagella-ba. 



PliatMK'.ystis Pouvhvti (II.' 



Only noticed during the diatom inflow, then often in large 

 quantities, although very variable with i-egard to frequency. 



Distribution: Arctic, oceanic (?) and boreal, neritic .species, 

 which developes in masses in the mixing-belt between the arctic 

 waters and those of the Atlantic. 



Known fi'om Greenland, Iceland, the Faeroe Islands (very fre- 

 quent during a few months of the year), the North Sea, (numer- 

 ous in the English Chaimel in May 1903), Skagerack and Cattegat. 

 On the west coast of Noiway in large masses in the mouths of 

 March—May 1898. 



"VI. S±l±co£lagellata- 



<ii,Viiiiiilst4'r jH'Titasterias (I-Iiirb.) Schutt. 



Is this really a dinotlagellatc as Schutt means? Occurs fairly 

 often in bottom samples and certainly is due to a plankton form. 

 Also occasionally found in slides from plankton preparations; but 



