18 



ASTRID CLEVE-EULEK, QUANTITATIVR PLANKTON RESEARCHES IN THE SKAGER RAK. 



with the more litoral group from surface to bottom, and its constituents as well mBaralia, 

 with nearly 5000 ind. per 1 at 50 m, are here at their maximum. Thalassiothrix nitz- 

 schioides is on the contrary less frequent than further in towards the Kattegat; it has 

 just begun to propagate a little. A larger Thalassiothrix, probably Th. Frauenfeldii 

 (it always occurred singly), increases downwards and may belong to the Styli-group. 



Table 19. 



S. Skag. 



57° 42' N., 9° 61' E. 



6. XI. 1912. 



i O 



CBo 



Q. 



S £ 



h5 



cö 



c3 



-^ _ 

 o — 

 O 3 



.Si fe 



ga 



i — i Cö 



2^ 



.2 "5 



O.» 



ö ° 



tD O 





Z v 



cö «■« 



co o, 



x 9> 



Q 10 



W »• 



70 



230 



210 



200 



260 



250 



250 



270 



100 



130 



50 



130 



E.2 



3 C8 



: O. 



t- CD 



i. o 



O 3 



.C 















c3 



s 



s 



fl m 

 ** cb 



S £ 



2 2 



a 



o <» 



3 os 



3 CO 



,2 a 

 ^ '5b 

 ej o 



3 3 



3 (» 



.a § 



ge 



•" cd 



• - o 

 « a 



CD ^ 





s 



CÖ 3 



6 



O 



o — 



O- 



o 



i* C 



CD 



O 



CO 



é s 



C g 



p s 



fe s 



■ S, S * 



cd C 

 fe 





 10 

 20 

 30 

 40 

 50 



7,93 

 9,04 

 9,46 



9,95 

 10,17 

 10,20 



33,24 

 33,06 



33,80 

 34,11 

 34,18 

 34,18 



25,93 

 26,09 

 26,12 

 26,30 

 26,30 

 26,30 



10 



10 



30 



150 



40 



100 



40 



50 





470 



70 



120 



70 



60 



30 





400 





50 



10 



30 



70 



10 



170 





20 



30 





30 





120 





10 



10 





10 





50 





10 







10 



30 



50 



100 



160 



60 



20 



1,030 



1,070 



1,110 



810 



240 



230 



The Ceratia are less frequent here than at S. Extra II, on the other side a small 

 Exauviella, that may be the E. perforata, newly described by Gran, and Distephanus 

 speculum get up among the more common forms. Two slightly different kinds of water 

 superpose each other, of whieh the lower and a trifle salter one is poorer in peridinians. 



Table 20. S. Skag. 6. 57° 56' N., 9° 40' E. 6. XI. 1912. 



Jfl 



fe 



cd 



Q 



Tempera- 

 ture ° C. 



o 

 o 



o 



>> 



-*> 



fl 



"3 

 m 



O* 



co 



C 

 CD 



Q 



co as 

 ;~ -*» 

 cö ^ 

 2 o 

 cö " 

 fe co 



CO 



3 

 t> ii 



CO CD 



O S 



CO +i 



>. co 



M 



Coscino- 

 discus spp. 



Guinardia 

 flaccida 



Rhizosolenia 

 semispina 



Rhizosolenia 

 styliformis 



Thalassio- 

 thrix nitz- 

 schioides 



Thalassio- 

 thrix 

 Frauenfeldii 



Biddulphia 

 sinensis 



Navieuloid 



diatoms 

 + Nitzschiae 



Diatoms 



total 

 numbers 







8,58 



33,68 



26,17 



120 



20 







20 



10 



20 



60 



10 



60 



450 



10 



8,08 



— 



— 



480 



50 



40 



20 









70 





90 



770 



20 



9,45 



34,13 



26,38 



600 





60 



20 



10 



15 



40 



60 





40 



940 



30 



9,62 



34,29 



26,48 



900 



40 



40 





5 





20 



30 





160 



1,255 



40 

 50 



9,91 

 9,89 



34,45 



34,51 



26,56 

 26,61 



1,300 

 1,630 



20 



60 



40 

 30 



20 



15 

 10 





20 



30 





210 



230 



1 ,865 

 2,050 





60 



9,83 



34,52 



26,03 



2,420 



10 



80 









10 



20 





260 



3,015 



80 



9,4 7 



34,63 



26,77 



2,000 



60 



30 



Kl 



15 











220 



2,415 



100 



9,50 



34,01 



26,77 



1,990 









10 



10 



30 



40 





250 



2,480 



Also here, the resemblance to the previous stations is obvious. The plankton is 

 somewhat less rich than it is closer to land, but not much. Traces of Styli-plankton are 

 visible, at the surface, at the side of Rhizosolenia semispina, that although very rare still, 

 is present throughout the water. At the eastern stations already dealt with, this leading 

 winter-form was still quite single. 



