42 



ASTRID CLEVE-EULER, QUANTITAT1VE PLANKTON RESEARCHES IN THE SKAGER RAK. 



There are, on the contrary, reasons to believe the chief development of Leptocylindrus 

 to be already accomplished. A special hint in this direction is the crowding up of the 

 species in question at S. Skag. 8 (see below) in a water, much too salt to its taste, into 

 which it must have been whirled together by means of currents, and where it is actually 

 more frequent than in the real centres of development. 



Table 64. 8. Extra II. 58° 43' N., 11° 7' E. 17. IV. 1914. 



o. 





O 



43 



>> 



•2 

 ''B 



o 



.2 



CD 



.2 



niales 



tal 



bers 



s 



3 



Is 



8 



Cw 

 O 



cä ec 

 o ^ 



N "3 * 



o 5-5 



03 



Q 



S t 



ii 3 



"3 

 w 



CO 



C 

 OJ 



Q 



c 



a 



O 



u 



Oj 



O 





■5°g 



"C 2 



o 

 co 

 dl 



1=5 



CO 



o £ g 

 bi •" 

 PM c 







7,54 



22,63 



17,68 



1,980 



100 



600 



3,540 



560 



1 ,440 ! 



2,480 



10 



5,03 



31,15 



24,64 



2,150 



730 



710 



5,090 



1,500 



960 



4,290 



20 



5,45 



32,66 



25,80 



1 ,800 



150 



500 



3,850 



200 



150 



1,800 



30 



5,38 



32,75 



25,88 



650 





250 



1,300 



350 



100 



650 



38 



5,36 



33,69 



26,61 



450 







1,000 



250 



50 



550 



Peridinians are a trifle more numerous, and infusorians equally spread, compared 

 to the data of a year ago. The very surface-water is less scanty in organisms. 



Table G5. S. Skag. 0. 57° 41' N., 11° 24' E. 17. IV 1914. 



— 



o, 



Q 



2^ 



C£>o 



S £ 



CD 3 



o 



o 



'3 

 t» 



o 



>> 



*5> 



a 

 oj 



Q 



CO 



'35 ca 



.5 *0 

 w "T 



CO > 



C3 05 



"3 60 



H 



Thalassiosiia 

 Norden- 

 skiöldii 



Lauderia 



borealis & 



glaoialis 



Coscinodis- 



cus con- 



cinnus 



Sceletonema 

 costatum 



Paralia 

 sulcata 



cä 



a ^ 



G CJ 



1° 



w ti) 

 CÖ <£i 



fe PQ 

 O 



c3 



•- C» 



P. 3 



SS 



CO -~ 



3 o 



Asterionella 

 japonica 



Leptocylin- 

 drus danicus 



Rhizosolenia 

 semispina 



Chaetoceras 

 contortum 



.2 



cu'3 



13 c 



-a -s 



.3 co 



m 



Diatoms 



total 

 numbers 







7,61 



21,29 



16,60 











380 







640 







2,420 



1 ,500 



280 





9,870 



10 



6,54 



30,73 



24,14 



400 













100 



150 







18,000 



2,750 



5,000 





30,410 



20 



6,08 



31,44 



24,76 



800 



100 



250 



50 



150 



(700) 



250 



100 



700 





7,800 



3,400 



2,200 





22,600 



30 



5,57 



32,4 1 



25,58 



450 



100 



1,000 



50 



2,000 





400 



400 







2,150 



3,050 



700 





17,900 



40 



5,59 



32,52 



25,67 



700 



120 



680 





1,000 



(250) 



260 



220 



780 





1,280 



3,26!) 



80 



40 



14,060 



50 



5,25 



33,03 



26,11 



800 



120 



740 



60 



3,760 



80 



320 



360 



300 



260 



1,280 



2,240 



520 





21,750 



60 



5,17 



33,75 



26,67 



740 



420 



760 



80 



20,800 



1,760 



200 



900 



260 



100 



280 



300 



100 



+ 80 



20 



39,420 



80 



5,10 



33,98 



26,87 



480 



540 



680 



120 



49,740 



3,360 



100 



180 



160 



260 



540 



640 



600 

 4- 160 



680 



68,460 



90 



5,10 



— 



— 



500 



650 



1,550 



300 



120,600 



2,400 



700 



450 



150 



1,550 



800 



2,050 



5,900 

 + 700 



1,400 



158,810 



At the Swedish station Skag. 0, the general aspect of the plankton-distribution is 

 similar to that of S. Extra II, but for the southern immigrants being a little less numerous, 

 at least in the middle and upper layers. Near the bottom, such heavy and large diatoms 

 as Paralia and Biddulphia sinensis are accumulating, as well as the small Sceletonema, 



1 The numbers of this colunin are perhaps too low, some of the undetermiaable infusorians being pro- 

 bably LaboecB. 



